CHICAGO ZOOLOGICAL SOCIETY: Form 990, tax year 2024

View the entire original 990 at ProPublica ↗

Organization: CHICAGO ZOOLOGICAL SOCIETY (EIN 36-2167016)
Tax period: 2024-04-01 to 2025-03-31
Filed: 2025-09-10
IRS object ID: 202532539349300108
Schema version: 2024v5.2
Source: Download XML · Original 990 at ProPublica

Every field in the e-filed return. Faint text is the IRS element name, for citing.

Return header
Form 990
Schedule A
Schedule B
Schedule C
Schedule D
Schedule F
Schedule G
Schedule I
Schedule J
Schedule K
Schedule L
Schedule M
Schedule O

Return header ReturnHeader

Field	Value	IRS element (for citing)
Return	2025-09-10T07:30:40-00:00	ReturnTs
Tax Period End	2025-03-31	TaxPeriodEndDt

Preparer Firm PreparerFirmGrp

Field	Value	IRS element (for citing)
Preparer Firm EIN	331498605	PreparerFirmEIN

Preparer Firm Name PreparerFirmName

Field	Value	IRS element (for citing)
Business Name Line1	Plante Moran PLLC	BusinessNameLine1Txt

Preparer US Address PreparerUSAddress

Field	Value	IRS element (for citing)
Address Line1	10 South Riverside Plaza 9th floor	AddressLine1Txt
City	Chicago	CityNm
State Abbreviation	IL	StateAbbreviationCd
ZIP	60606	ZIPCd

Field	Value	IRS element (for citing)
Return Type	990	ReturnTypeCd
Tax Period Begin	2024-04-01	TaxPeriodBeginDt

Filer Filer

Field	Value	IRS element (for citing)
EIN	362167016	EIN

Business Name BusinessName

Field	Value	IRS element (for citing)
Business Name Line1	Chicago Zoological Society	BusinessNameLine1Txt

Field	Value	IRS element (for citing)
Business Name Control	CHIC	BusinessNameControlTxt
Phone	7086888300	PhoneNum

US Address USAddress

Field	Value	IRS element (for citing)
Address Line1	3300 Golf Road	AddressLine1Txt
City	Brookfield	CityNm
State Abbreviation	IL	StateAbbreviationCd
ZIP	60513	ZIPCd

Business Officer BusinessOfficerGrp

Field	Value	IRS element (for citing)
Person	Michael J Adkesson	PersonNm
Person Title	President and CEO	PersonTitleTxt
Phone	7086888300	PhoneNum
Signature	2025-09-10	SignatureDt
Discuss With Paid Preparer	Yes (true)	DiscussWithPaidPreparerInd

Preparer Person PreparerPersonGrp

Field	Value	IRS element (for citing)
Preparer Person	LuAnn Trapp	PreparerPersonNm
PTIN	P01506476	PTIN
Phone	3122071040	PhoneNum
Preparation	2025-09-10	PreparationDt

Field	Value	IRS element (for citing)
Tax	2024	TaxYr
Build TS	2025-03-06 01:10:19Z	BuildTS

Form 990 IRS990

Doing Business As Name DoingBusinessAsName

Field	Value	IRS element (for citing)
Business Name Line1	Brookfield Zoo Chicago	BusinessNameLine1Txt

Field	Value	IRS element (for citing)
Principal Officer	Michael J Adkesson	PrincipalOfficerNm

US Address USAddress

Field	Value	IRS element (for citing)
Address Line1	3300 Golf Road	AddressLine1Txt
City	Brookfield	CityNm
State Abbreviation	IL	StateAbbreviationCd
ZIP	60513	ZIPCd

Field	Value	IRS element (for citing)
Gross Receipts	$117,595,062	GrossReceiptsAmt
Group Return For Affiliates	false	GroupReturnForAffiliatesInd
Organization501c3	Yes (X)	Organization501c3Ind
Website Address	www.brookfieldzoo.org	WebsiteAddressTxt
Type Of Organization Corp	Yes (X)	TypeOfOrganizationCorpInd
Formation	1921	FormationYr
Legal Domicile State	IL	LegalDomicileStateCd
Activity Or Mission	To inspire conservation leadership by connecting people with wildlife and nature.	ActivityOrMissionDesc
Voting Members Governing Body	44	VotingMembersGoverningBodyCnt
Voting Members Independent	41	VotingMembersIndependentCnt
Total Employee	791	TotalEmployeeCnt
Total Volunteers	242	TotalVolunteersCnt
Total Gross UBI	$167,670	TotalGrossUBIAmt
Net Unrelated Bus Txbl Incm	$64,544	NetUnrelatedBusTxblIncmAmt
PY Contributions Grants	$54,102,303	PYContributionsGrantsAmt
CY Contributions Grants	$62,243,873	CYContributionsGrantsAmt
PY Program Service Revenue	$36,016,175	PYProgramServiceRevenueAmt
CY Program Service Revenue	$40,646,946	CYProgramServiceRevenueAmt
PY Investment Income	$4,492,644	PYInvestmentIncomeAmt
CY Investment Income	$5,510,186	CYInvestmentIncomeAmt
PY Other Revenue	-$351,051	PYOtherRevenueAmt
CY Other Revenue	-$411,390	CYOtherRevenueAmt
PY Total Revenue	$94,260,071	PYTotalRevenueAmt
CY Total Revenue	$107,989,615	CYTotalRevenueAmt
PY Grants And Similar Paid	$197,281	PYGrantsAndSimilarPaidAmt
CY Grants And Similar Paid	$194,007	CYGrantsAndSimilarPaidAmt
CY Benefits Paid To Members	$0	CYBenefitsPaidToMembersAmt
PY Salaries Comp Emp Bnft Paid	$39,305,223	PYSalariesCompEmpBnftPaidAmt
CY Salaries Comp Emp Bnft Paid	$42,338,127	CYSalariesCompEmpBnftPaidAmt
PY Total Prof Fndrsng Expns	$523,550	PYTotalProfFndrsngExpnsAmt
CY Total Prof Fndrsng Expns	$218,375	CYTotalProfFndrsngExpnsAmt
CY Total Fundraising Expense	$3,814,113	CYTotalFundraisingExpenseAmt
PY Other Expenses	$35,469,292	PYOtherExpensesAmt
CY Other Expenses	$35,629,088	CYOtherExpensesAmt
PY Total Expenses	$75,495,346	PYTotalExpensesAmt
CY Total Expenses	$78,379,597	CYTotalExpensesAmt
PY Revenues Less Expenses	$18,764,725	PYRevenuesLessExpensesAmt
CY Revenues Less Expenses	$29,610,018	CYRevenuesLessExpensesAmt
Total Assets BOY	$265,240,000	TotalAssetsBOYAmt
Total Assets EOY	$317,202,000	TotalAssetsEOYAmt
Total Liabilities BOY	$70,637,000	TotalLiabilitiesBOYAmt
Total Liabilities EOY	$94,014,000	TotalLiabilitiesEOYAmt
Net Assets Or Fund Balances BOY	$194,603,000	NetAssetsOrFundBalancesBOYAmt
Net Assets Or Fund Balances EOY	$223,188,000	NetAssetsOrFundBalancesEOYAmt
Mission	To inspire conservation leadership by connecting people with wildlife and nature.	MissionDesc
Significant New Program Srvc	false	SignificantNewProgramSrvcInd
Significant Change	false	SignificantChangeInd
Expense	$28,601,004	ExpenseAmt
Revenue	$28,688,626	RevenueAmt
Desc	Park Operations The CZS maintains 75 buildings on 235 acres of land to exhibit over 2,500 animals. In a typical year, two million visitors annually enjoy the experience of seeing and learning about the animals of the world. Each individual that enters through Brookfield Zoos gates represents an opportunity to introduce representatives of the wild world, to convey our intertwined connections to the animal kingdom, and to encourage positive change in the world. The Zoo is open almost every day of the year. Admission is free to the general public 52 days/year and at all times to Illinois school groups and military personnel. The membership team services our 109,000 member households, providing them with the opportunity to participate in the conservation and educational efforts of CZS. The events team provides seasonal and animal themed events such as Earth Day, Spring Fest, Hispanic Heritagefest, Holiday Magic and Boo at the Zoo. Visitor services provides narrated tram tours and accessible transportation options in the park.	Desc

Prog Srvc Accom Acty2 ProgSrvcAccomActy2Grp

Field	Value	IRS element (for citing)
Expense	$29,870,000	ExpenseAmt
Grant	$156,007	GrantAmt
Revenue	$3,229,814	RevenueAmt
Desc	Animal Health, Welfare, Care and Programs More than 2500 ambassadors of the animal kingdom provide our visitors with a rare opportunity to see species from around the globe and experience up close, personal encounters. CZS staff provide expert care of these ambassadors, where innovations in husbandry techniques and pioneering breeding programs are part of the cuttting edge culture of excellence and integrating disciplines such as population biology, behavioral science, nutrition and veterinary science help determine the best ways to provide and continuously care for the animals. CZS also incorporates models and practices from an array of animal care professionals around the world, to develop the best possible zoo-based animal care and management practices. Through Keeper Chats and Ambassador Animal Encounters, staff share their knowledge of the animals in their care with zoo guests, helping them gain an appreciation for all citizens of the natural world. Through field programs,CZS support efforts to protect and restore populations of threatened species in other parts of the world.	Desc

Prog Srvc Accom Acty3 ProgSrvcAccomActy3Grp

Field	Value	IRS element (for citing)
Expense	$4,106,000	ExpenseAmt
Grant	$38,000	GrantAmt
Revenue	$298,248	RevenueAmt
Desc	Education and Community Engagement Through its education programs, CZS communicates with others to engender in them a sense of ownership about living harmoniously with nature and helping save endangered species. Education specialists, volunteers, curators, graphic and exhibit designers, photographers and many others contribute to sharing this information both in person and virtually. As well as reaching the daily visitors to the Zoo, CZSs education and outreach programming reaches out to would be conservationists outside of the Zoo including classrooms of school children and teachers, local libraries and community organizations to engage them in nature based programs, strengthening the bridge between education and conservation and working together to create healthy spaces for people and wildlife.	Desc

Field	Value	IRS element (for citing)
Total Program Service Expenses	$62,577,004	TotalProgramServiceExpensesAmt
Described In Section501c3	Yes (true)	DescribedInSection501c3Ind
Schedule B Required	Yes (true)	ScheduleBRequiredInd
Political Campaign Acty	false	PoliticalCampaignActyInd
Lobbying Activities	Yes (true)	LobbyingActivitiesInd
Subject To Proxy Tax	false	SubjectToProxyTaxInd
Donor Advised Fund	Yes (true)	DonorAdvisedFundInd
Conservation Easements	false	ConservationEasementsInd
Collections Of Art	Yes (true)	CollectionsOfArtInd
Credit Counseling	false	CreditCounselingInd
Donor Rstr Or Quasi Endowments	Yes (true)	DonorRstrOrQuasiEndowmentsInd
Report Land Building Equipment	Yes (true)	ReportLandBuildingEquipmentInd
Report Investments Other Sec	false	ReportInvestmentsOtherSecInd
Report Program Related Invst	false	ReportProgramRelatedInvstInd
Report Other Assets	false	ReportOtherAssetsInd
Report Other Liabilities	Yes (true)	ReportOtherLiabilitiesInd
Include FIN48 Footnote	false	IncludeFIN48FootnoteInd
Independent Audit Fincl Stmt	Yes (true)	IndependentAuditFinclStmtInd
Consolidated Audit Fincl Stmt	Yes (true)	ConsolidatedAuditFinclStmtInd
School Operating	false	SchoolOperatingInd
Foreign Office	false	ForeignOfficeInd
Foreign Activities	Yes (true)	ForeignActivitiesInd
More Than5000 K To Org	Yes (true)	MoreThan5000KToOrgInd
More Than5000 K To Individuals	Yes (true)	MoreThan5000KToIndividualsInd
Professional Fundraising	Yes (true)	ProfessionalFundraisingInd
Fundraising Activities	Yes (true)	FundraisingActivitiesInd
Gaming Activities	Yes (true)	GamingActivitiesInd
Operate Hospital	false	OperateHospitalInd
Grants To Organizations	Yes (true)	GrantsToOrganizationsInd
Grants To Individuals	Yes (true)	GrantsToIndividualsInd
Schedule J Required	Yes (true)	ScheduleJRequiredInd
Tax Exempt Bonds	Yes (true)	TaxExemptBondsInd
Invest Tax Exempt Bonds	false	InvestTaxExemptBondsInd
Escrow Account	false	EscrowAccountInd
On Behalf Of Issuer	false	OnBehalfOfIssuerInd
Engaged In Excess Benefit Trans	false	EngagedInExcessBenefitTransInd
PY Excess Benefit Trans	false	PYExcessBenefitTransInd
Loan Outstanding	Yes (true)	LoanOutstandingInd
Grant To Related Person	false	GrantToRelatedPersonInd
Business Rln With Org Mem	false	BusinessRlnWithOrgMemInd
Business Rln With Fam Mem	false	BusinessRlnWithFamMemInd
Business Rln With35 Ctrl Ent	Yes (true)	BusinessRlnWith35CtrlEntInd
Deductible Non Cash Contri	Yes (true)	DeductibleNonCashContriInd
Deductible Art Contribution	false	DeductibleArtContributionInd
Terminate Operations	false	TerminateOperationsInd
Partial Liquidation	false	PartialLiquidationInd
Disregarded Entity	false	DisregardedEntityInd
Related Entity	false	RelatedEntityInd
Related Organization Ctrl Ent	false	RelatedOrganizationCtrlEntInd
Trnsfr Exmpt Non Chrtbl Rltd Org	false	TrnsfrExmptNonChrtblRltdOrgInd
Activities Conducted Prtshp	false	ActivitiesConductedPrtshpInd
Schedule O Required	Yes (true)	ScheduleORequiredInd
IRP Document	106	IRPDocumentCnt
IRP Document W2 G	0	IRPDocumentW2GCnt
Backup Wthld Compliance	Yes (true)	BackupWthldComplianceInd
Employee	791	EmployeeCnt
Employment Tax Returns Filed	Yes (true)	EmploymentTaxReturnsFiledInd
Unrelated Bus Incm Over Limit	Yes (true)	UnrelatedBusIncmOverLimitInd
Form990 T Filed	Yes (true)	Form990TFiledInd
Foreign Financial Account	false	ForeignFinancialAccountInd
Prohibited Tax Shelter Trans	false	ProhibitedTaxShelterTransInd
Taxable Party Notification	false	TaxablePartyNotificationInd
Nondeductible Contributions	false	NondeductibleContributionsInd
Quid Pro Quo Contributions	Yes (true)	QuidProQuoContributionsInd
Quid Pro Quo Contri Discl	Yes (true)	QuidProQuoContriDisclInd
Form8282 Property Disposed Of	false	Form8282PropertyDisposedOfInd
Rcv Fnds To Pay Prsnl Bnft Cntrct	false	RcvFndsToPayPrsnlBnftCntrctInd
Pay Premiums Prsnl Bnft Cntrct	false	PayPremiumsPrsnlBnftCntrctInd
Indoor Tanning Services	false	IndoorTanningServicesInd
Subj To Tax Rmnrtn Ex Prcht Pymt	false	SubjToTaxRmnrtnExPrchtPymtInd
Subject To Excs Tax Net Invst Inc	false	SubjectToExcsTaxNetInvstIncInd
Info In Schedule O Part VI	Yes (X)	InfoInScheduleOPartVIInd
Governing Body Voting Members	44	GoverningBodyVotingMembersCnt
Independent Voting Member	41	IndependentVotingMemberCnt
Family Or Business Rln	false	FamilyOrBusinessRlnInd
Delegation Of Mgmt Duties	Yes (true)	DelegationOfMgmtDutiesInd
Change To Org Documents	false	ChangeToOrgDocumentsInd
Material Diversion Or Misuse	false	MaterialDiversionOrMisuseInd
Members Or Stockholders	Yes (true)	MembersOrStockholdersInd
Election Of Board Members	Yes (true)	ElectionOfBoardMembersInd
Decisions Subject To Approva	false	DecisionsSubjectToApprovaInd
Minutes Of Governing Body	Yes (true)	MinutesOfGoverningBodyInd
Minutes Of Committees	Yes (true)	MinutesOfCommitteesInd
Officer Mailing Address	false	OfficerMailingAddressInd
Local Chapters	false	LocalChaptersInd
Form990 Provided To Gvrn Body	Yes (true)	Form990ProvidedToGvrnBodyInd
Conflict Of Interest Policy	Yes (true)	ConflictOfInterestPolicyInd
Annual Disclosure Covered Prsn	Yes (true)	AnnualDisclosureCoveredPrsnInd
Regular Monitoring Enfrc	Yes (true)	RegularMonitoringEnfrcInd
Whistleblower Policy	Yes (true)	WhistleblowerPolicyInd
Document Retention Policy	Yes (true)	DocumentRetentionPolicyInd
Compensation Process CEO	Yes (true)	CompensationProcessCEOInd
Compensation Process Other	Yes (true)	CompensationProcessOtherInd
Investment In Joint Venture	false	InvestmentInJointVentureInd
States Where Copy Of Return Is Fld	FL	StatesWhereCopyOfReturnIsFldCd
States Where Copy Of Return Is Fld	IL	StatesWhereCopyOfReturnIsFldCd
States Where Copy Of Return Is Fld	WI	StatesWhereCopyOfReturnIsFldCd
Upon Request	Yes (X)	UponRequestInd

Books In Care Of Detail BooksInCareOfDetail

Field	Value	IRS element (for citing)
Person	David E Burns	PersonNm
Phone	7086888387	PhoneNum

US Address USAddress

Field	Value	IRS element (for citing)
Address Line1	3300 Golf Road	AddressLine1Txt
City	Brookfield	CityNm
State Abbreviation	IL	StateAbbreviationCd
ZIP	60513	ZIPCd

Form990 Part VII Section A Form990PartVIISectionAGrp (57 entries)

TitleTitleTxt	Average Hours Per WeekAverageHoursPerWeekRt	Individual Trustee Or DirectorIndividualTrusteeOrDirectorInd	OfficerOfficerInd	Reportable Comp From OrgReportableCompFromOrgAmt	Reportable Comp From Rltd OrgReportableCompFromRltdOrgAmt	Other CompensationOtherCompensationAmt	Key EmployeeKeyEmployeeInd	Highest Compensated EmployeeHighestCompensatedEmployeeInd
Dr Michael Adkesson
President and CEO	040.00	Yes (X)	Yes (X)	$692,858	$0	$104,553
David E Burns
Chief Financial and Admin. Officer	040.00			$388,865	$0	$83,409	Yes (X)
Cathleen Brueggemann
Sr. VP Development	040.00			$317,613	$0	$47,262	Yes (X)
Andrea S Rodgers
Sr. VP Guest Experience Operations	040.00			$244,810	$0	$32,933	Yes (X)
Jennifer L Baader
Sr. VP Govt Affairs	040.00			$236,116	$0	$30,995	Yes (X)
Dr Sathya K Chinnadurai
Sr. VP Animal Health Welfare	040.00			$214,505	$0	$44,515	Yes (X)
Sandra L Dornhecker
Sr. VP Human Resources	040.00			$225,740	$0	$28,611	Yes (X)
Randall Wells
VP Marine Mammal Conservation	040.00			$194,171	$0	$29,015		Yes (X)
Shannon Heston
VP Information Technology	040.00			$181,871	$0	$39,066		Yes (X)
Melissa Lewkowich
VP Risk Facilities Mgmt	040.00			$186,448	$0	$31,090		Yes (X)
Heather Bilcer
VP Finance	040.00			$195,060	$0	$6,240		Yes (X)
Jerome E Johnston
VP Guest Services Operations	040.00			$177,475	$0	$10,968		Yes (X)
Cherryl T Thomas
Chair of the Board	002.00	Yes (X)	Yes (X)	$0	$0	$0
William C Kunkler III
Deputy Chair of the Board	002.00	Yes (X)	Yes (X)	$0	$0	$0
Elizabeth Hamill Bramsen
Vice-Chair of the Board	002.00	Yes (X)	Yes (X)	$0	$0	$0
Merrick M Elfman
Vice-Chair of the Board	002.00	Yes (X)	Yes (X)	$0	$0	$0
Bert A Getz Jr
Vice-Chair of the Board	002.00	Yes (X)	Yes (X)	$0	$0	$0
John P Grube
Vice-Chair of the Board	002.00	Yes (X)	Yes (X)	$0	$0	$0
Molly Keller
Vice-Chair of the Board	002.00	Yes (X)	Yes (X)	$0	$0	$0
Michael P Emmert
Treasurer	002.00	Yes (X)	Yes (X)	$0	$0	$0
Randall G Vickery
Secretary	002.00	Yes (X)	Yes (X)	$0	$0	$0
Stuart B Abelson
Trustee	002.00	Yes (X)		$0	$0	$0
Walter W Becky II
Trustee	002.00	Yes (X)		$0	$0	$0
Jennifer L Bellini
Trustee	002.00	Yes (X)		$0	$0	$0
Jay D Bergman
Trustee	002.00	Yes (X)		$0	$0	$0
Edward McCormick Blair Jr
Trustee	002.00	Yes (X)		$0	$0	$0
Barbara J Bradford
Trustee	002.00	Yes (X)		$0	$0	$0
James A Bryan
Trustee	002.00	Yes (X)		$0	$0	$0
Michael G Canning
Trustee	002.00	Yes (X)		$0	$0	$0
John A Carpenter
Trustee	002.00	Yes (X)		$0	$0	$0
Dr Bonny Chen
Trustee	002.00	Yes (X)		$0	$0	$0
Rita Sola Cook
Trustee	002.00	Yes (X)		$0	$0	$0
JR Davis III
Trustee	002.00	Yes (X)		$0	$0	$0
Michael F DeSantiago
Trustee	002.00	Yes (X)		$0	$0	$0
Gregory J DiDomenico
Trustee	002.00	Yes (X)		$0	$0	$0
Michael Drai
Trustee	002.00	Yes (X)		$0	$0	$0
Sunny Elebua
Trustee as of 10/24	002.00	Yes (X)		$0	$0	$0
Dr Lisa C Freeman
Trustee	002.00	Yes (X)		$0	$0	$0
Matthew Gambs
Trustee as of 10/24	002.00	Yes (X)		$0	$0	$0
Sasha L Gerritson
Trustee	002.00	Yes (X)		$0	$0	$0
Darius A Gill
Trustee	002.00	Yes (X)		$0	$0	$0
Barbara Grayson
Trustee	002.00	Yes (X)		$0	$0	$0
Heidi Huizenga
Trustee	002.00	Yes (X)		$0	$0	$0
Kevin M Keeley
Trustee	002.00	Yes (X)		$0	$0	$0
Kevin M Killips
Trustee	002.00	Yes (X)		$0	$0	$0
Barbara Levy Kipper
Trustee	002.00	Yes (X)		$0	$0	$0
Jerry Manne
Trustee	002.00	Yes (X)		$0	$0	$0
Tim Ozinga
Trustee	002.00	Yes (X)		$0	$0	$0
Stan Pepper
Trustee as of 11/24	002.00	Yes (X)		$0	$0	$0
Toni Preckwinkle
Trustee	002.00	Yes (X)		$0	$0	$0
Elizabeth S Quinn
Trustee	002.00	Yes (X)		$0	$0	$0
Benita S Romano
Trustee	002.00	Yes (X)		$0	$0	$0
Mark G Sander
Trustee	002.00	Yes (X)		$0	$0	$0
Kelley C Schueler
Trustee	002.00	Yes (X)		$0	$0	$0
Patrick E Whiteside
Trustee	002.00	Yes (X)		$0	$0	$0
Joseph A Gregoire
Trustee thru of 12/24	002.00	Yes (X)		$0	$0	$0
Stuart D Strahl PhD
Trustee thru of 3/25	002.00	Yes (X)		$0	$0	$0

Field	Value	IRS element (for citing)
Total Reportable Comp From Org	$3,255,532	TotalReportableCompFromOrgAmt
Total Other Compensation	$488,657	TotalOtherCompensationAmt
Indiv Rcvd Greater Than100 K	46	IndivRcvdGreaterThan100KCnt
Former Ofcr Employees Listed	false	FormerOfcrEmployeesListedInd
Total Comp Greater Than150 K	Yes (true)	TotalCompGreaterThan150KInd
Compensation From Other Srcs	false	CompensationFromOtherSrcsInd

Contractor Compensation ContractorCompensationGrp (5 entries)

Address Line1ContractorAddress/USAddress/AddressLine1Txt	CityContractorAddress/USAddress/CityNm	State AbbreviationContractorAddress/USAddress/StateAbbreviationCd	ZIPContractorAddress/USAddress/ZIPCd	ServicesServicesDesc	CompensationCompensationAmt
Two by Four
10 N Dearborn St Suite 1000	Chicago	IL	60602	Advertising/Consulting	$1,389,048
University of Illinois
506 S Wright St	Urbana	IL	61802	Veterinary/Pathology/Lab Services	$710,400
SSA Group LLC
4624 Central Blvd Suite 100	Denver	CO	80238	Catering Services	$634,653
Paymentech LLC
14221 Dallas Parkway	Dallas	TX	75254	Payment Card Processing Services	$630,814
Chilton Yambert Porter LLP
303 W Madison Suite 2300	Chicago	IL	60606	Legal Services	$620,516

Field	Value	IRS element (for citing)
Cntrct Rcvd Greater Than100 K	53	CntrctRcvdGreaterThan100KCnt
Fundraising	$1,964,359	FundraisingAmt
Government Grants	$24,195,231	GovernmentGrantsAmt
All Other Contributions	$36,084,283	AllOtherContributionsAmt
Noncash Contributions	$2,944,774	NoncashContributionsAmt
Total Contributions	$62,243,873	TotalContributionsAmt

Program Service Revenue ProgramServiceRevenueGrp (5 entries)

DescDesc	BusinessBusinessCd	Total Revenue ColumnTotalRevenueColumnAmt	Related Or Exempt Func IncomeRelatedOrExemptFuncIncomeAmt	ExclusionExclusionAmt
General Admissions	900099	$8,706,943	$8,706,943
Memberships	900099	$16,704,448	$16,704,448
Visitor Services	900099	$7,599,307	$2,382,107	$5,217,200
Admissions-Internal Attractions	900099	$2,944,739	$2,944,739
Visitor Parking	900099	$3,176,203		$3,176,203

Total Oth Program Service Rev TotalOthProgramServiceRevGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$1,515,306	TotalRevenueColumnAmt
Related Or Exempt Func Income	$1,310,781	RelatedOrExemptFuncIncomeAmt
Unrelated Business Revenue	$167,670	UnrelatedBusinessRevenueAmt
Exclusion	$36,855	ExclusionAmt

Field	Value	IRS element (for citing)
Total Program Service Revenue	$40,646,946	TotalProgramServiceRevenueAmt

Investment Income InvestmentIncomeGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$3,909,124	TotalRevenueColumnAmt
Exclusion	$3,909,124	ExclusionAmt

Gross Rents GrossRentsGrp

Field	Value	IRS element (for citing)
Real	$92,268	RealAmt

Rental Income Or Loss RentalIncomeOrLossGrp

Field	Value	IRS element (for citing)
Real	$92,268	RealAmt

Net Rental Income Or Loss NetRentalIncomeOrLossGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$92,268	TotalRevenueColumnAmt
Exclusion	$92,268	ExclusionAmt

Gross Amount Sales Assets GrossAmountSalesAssetsGrp

Field	Value	IRS element (for citing)
Securities	$10,458,153	SecuritiesAmt

Less Cost Oth Basis Sales Expnss LessCostOthBasisSalesExpnssGrp

Field	Value	IRS element (for citing)
Securities	$8,857,091	SecuritiesAmt

Gain Or Loss GainOrLossGrp

Field	Value	IRS element (for citing)
Securities	$1,601,062	SecuritiesAmt

Net Gain Or Loss Investments NetGainOrLossInvestmentsGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$1,601,062	TotalRevenueColumnAmt
Exclusion	$1,601,062	ExclusionAmt

Field	Value	IRS element (for citing)
Fundraising Gross Income	$202,265	FundraisingGrossIncomeAmt
Contri Rpt Fundraising Event	$1,964,359	ContriRptFundraisingEventAmt
Fundraising Direct Expenses	$738,580	FundraisingDirectExpensesAmt

Net Incm From Fundraising Evt NetIncmFromFundraisingEvtGrp

Field	Value	IRS element (for citing)
Total Revenue Column	-$536,315	TotalRevenueColumnAmt
Exclusion	-$536,315	ExclusionAmt

Field	Value	IRS element (for citing)
Gaming Gross Income	$42,433	GamingGrossIncomeAmt
Gaming Direct Expenses	$9,776	GamingDirectExpensesAmt

Net Income From Gaming NetIncomeFromGamingGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$32,657	TotalRevenueColumnAmt
Exclusion	$32,657	ExclusionAmt

Total Revenue TotalRevenueGrp

Field	Value	IRS element (for citing)
Total Revenue Column	$107,989,615	TotalRevenueColumnAmt
Related Or Exempt Func Income	$32,049,018	RelatedOrExemptFuncIncomeAmt
Unrelated Business Revenue	$167,670	UnrelatedBusinessRevenueAmt
Exclusion	$13,529,054	ExclusionAmt

Grants To Domestic Orgs GrantsToDomesticOrgsGrp

Field	Value	IRS element (for citing)
Total	$56,239	TotalAmt
Program Services	$56,239	ProgramServicesAmt

Grants To Domestic Individuals GrantsToDomesticIndividualsGrp

Field	Value	IRS element (for citing)
Total	$32,500	TotalAmt
Program Services	$32,500	ProgramServicesAmt

Foreign Grants ForeignGrantsGrp

Field	Value	IRS element (for citing)
Total	$105,268	TotalAmt
Program Services	$105,268	ProgramServicesAmt

Benefits To Members BenefitsToMembersGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Comp Current Ofcr Directors CompCurrentOfcrDirectorsGrp

Field	Value	IRS element (for citing)
Total	$3,332,597	TotalAmt
Program Services	$1,117,561	ProgramServicesAmt
Management And General	$1,387,871	ManagementAndGeneralAmt
Fundraising	$827,165	FundraisingAmt

Comp Disqual Persons CompDisqualPersonsGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Other Salaries And Wages OtherSalariesAndWagesGrp

Field	Value	IRS element (for citing)
Total	$30,037,339	TotalAmt
Program Services	$24,836,524	ProgramServicesAmt
Management And General	$3,499,796	ManagementAndGeneralAmt
Fundraising	$1,701,019	FundraisingAmt

Pension Plan Contributions PensionPlanContributionsGrp

Field	Value	IRS element (for citing)
Total	$743,122	TotalAmt
Program Services	$552,359	ProgramServicesAmt
Management And General	$161,116	ManagementAndGeneralAmt
Fundraising	$29,647	FundraisingAmt

Other Employee Benefits OtherEmployeeBenefitsGrp

Field	Value	IRS element (for citing)
Total	$6,014,277	TotalAmt
Program Services	$5,163,929	ProgramServicesAmt
Management And General	$556,868	ManagementAndGeneralAmt
Fundraising	$293,480	FundraisingAmt

Payroll Taxes PayrollTaxesGrp

Field	Value	IRS element (for citing)
Total	$2,210,792	TotalAmt
Program Services	$1,842,855	ProgramServicesAmt
Management And General	$272,347	ManagementAndGeneralAmt
Fundraising	$95,590	FundraisingAmt

Fees For Services Management FeesForServicesManagementGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Fees For Services Legal FeesForServicesLegalGrp

Field	Value	IRS element (for citing)
Total	$856,536	TotalAmt
Management And General	$856,536	ManagementAndGeneralAmt

Fees For Services Accounting FeesForServicesAccountingGrp

Field	Value	IRS element (for citing)
Total	$136,915	TotalAmt
Management And General	$136,915	ManagementAndGeneralAmt

Fees For Services Lobbying FeesForServicesLobbyingGrp

Field	Value	IRS element (for citing)
Total	$52,272	TotalAmt
Management And General	$52,272	ManagementAndGeneralAmt

Fees For Services Prof Fundraising FeesForServicesProfFundraising

Field	Value	IRS element (for citing)
Total	$218,375	TotalAmt
Fundraising	$218,375	FundraisingAmt

Fees For Srvc Invst Mgmnt Fees FeesForSrvcInvstMgmntFeesGrp

Field	Value	IRS element (for citing)
Total	$143,606	TotalAmt
Management And General	$143,606	ManagementAndGeneralAmt

Fees For Services Other FeesForServicesOtherGrp

Field	Value	IRS element (for citing)
Total	$6,812,658	TotalAmt
Program Services	$5,985,056	ProgramServicesAmt
Management And General	$590,368	ManagementAndGeneralAmt
Fundraising	$237,234	FundraisingAmt

Advertising AdvertisingGrp

Field	Value	IRS element (for citing)
Total	$1,691,752	TotalAmt
Management And General	$1,691,752	ManagementAndGeneralAmt

Office Expenses OfficeExpensesGrp

Field	Value	IRS element (for citing)
Total	$7,119,294	TotalAmt
Program Services	$6,721,140	ProgramServicesAmt
Management And General	$245,806	ManagementAndGeneralAmt
Fundraising	$152,348	FundraisingAmt

Information Technology InformationTechnologyGrp

Field	Value	IRS element (for citing)
Total	$2,209,552	TotalAmt
Program Services	$478,022	ProgramServicesAmt
Management And General	$1,658,394	ManagementAndGeneralAmt
Fundraising	$73,136	FundraisingAmt

Royalties RoyaltiesGrp

Field	Value	IRS element (for citing)
Total	$38,087	TotalAmt
Program Services	$38,087	ProgramServicesAmt

Occupancy OccupancyGrp

Field	Value	IRS element (for citing)
Total	$2,634,876	TotalAmt
Program Services	$2,618,807	ProgramServicesAmt
Management And General	$14,485	ManagementAndGeneralAmt
Fundraising	$1,584	FundraisingAmt

Travel TravelGrp

Field	Value	IRS element (for citing)
Total	$314,784	TotalAmt
Program Services	$235,284	ProgramServicesAmt
Management And General	$45,571	ManagementAndGeneralAmt
Fundraising	$33,929	FundraisingAmt

Pymt Travel Entrtnmnt Pub Ofcl PymtTravelEntrtnmntPubOfclGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Conferences Meetings ConferencesMeetingsGrp

Field	Value	IRS element (for citing)
Total	$239,691	TotalAmt
Program Services	$126,440	ProgramServicesAmt
Management And General	$68,722	ManagementAndGeneralAmt
Fundraising	$44,529	FundraisingAmt

Interest InterestGrp

Field	Value	IRS element (for citing)
Total	$819,635	TotalAmt
Program Services	$819,635	ProgramServicesAmt

Payments To Affiliates PaymentsToAffiliatesGrp

Field	Value	IRS element (for citing)
Total	$0	TotalAmt

Depreciation Depletion DepreciationDepletionGrp

Field	Value	IRS element (for citing)
Total	$8,968,075	TotalAmt
Program Services	$8,528,997	ProgramServicesAmt
Management And General	$389,926	ManagementAndGeneralAmt
Fundraising	$49,529	FundraisingAmt

Insurance InsuranceGrp

Field	Value	IRS element (for citing)
Total	$1,436,316	TotalAmt
Program Services	$1,303,500	ProgramServicesAmt
Management And General	$93,671	ManagementAndGeneralAmt
Fundraising	$39,145	FundraisingAmt

Other Expenses OtherExpensesGrp (4 entries)

DescDesc	TotalTotalAmt	Program ServicesProgramServicesAmt
Animal Food and Transport	$1,478,295	$1,478,295
Revenue Bond Maintenance fees	$249,421	$249,421
Loss on Retirement of fixed assets	$32,826	$32,826
UBIT taxes	$20,329	$20,329

All Other Expenses AllOtherExpensesGrp

Field	Value	IRS element (for citing)
Total	$374,168	TotalAmt
Program Services	$233,930	ProgramServicesAmt
Management And General	$122,835	ManagementAndGeneralAmt
Fundraising	$17,403	FundraisingAmt

Total Functional Expenses TotalFunctionalExpensesGrp

Field	Value	IRS element (for citing)
Total	$78,379,597	TotalAmt
Program Services	$62,577,004	ProgramServicesAmt
Management And General	$11,988,857	ManagementAndGeneralAmt
Fundraising	$3,814,113	FundraisingAmt

Cash Non Interest Bearing CashNonInterestBearingGrp

Field	Value	IRS element (for citing)
BOY	$1,147,340	BOYAmt
EOY	$1,698,025	EOYAmt

Savings And Temp Cash Invst SavingsAndTempCashInvstGrp

Field	Value	IRS element (for citing)
BOY	$55,785,703	BOYAmt
EOY	$49,529,970	EOYAmt

Pledges And Grants Receivable PledgesAndGrantsReceivableGrp

Field	Value	IRS element (for citing)
BOY	$11,953,087	BOYAmt
EOY	$30,191,907	EOYAmt

Accounts Receivable AccountsReceivableGrp

Field	Value	IRS element (for citing)
BOY	$669,292	BOYAmt
EOY	$473,624	EOYAmt

Prepaid Expenses Defrd Charges PrepaidExpensesDefrdChargesGrp

Field	Value	IRS element (for citing)
BOY	$2,035,563	BOYAmt
EOY	$2,636,342	EOYAmt

Field	Value	IRS element (for citing)
Land Bldg Equip Cost Or Other Bss	$369,474,111	LandBldgEquipCostOrOtherBssAmt
Land Bldg Equip Accum Deprec	$195,935,753	LandBldgEquipAccumDeprecAmt

Land Bldg Equip Basis Net LandBldgEquipBasisNetGrp

Field	Value	IRS element (for citing)
BOY	$136,155,452	BOYAmt
EOY	$173,538,358	EOYAmt

Investments Pub Traded Sec InvestmentsPubTradedSecGrp

Field	Value	IRS element (for citing)
BOY	$57,153,000	BOYAmt
EOY	$58,917,000	EOYAmt

Other Assets Total OtherAssetsTotalGrp

Field	Value	IRS element (for citing)
BOY	$340,563	BOYAmt
EOY	$216,774	EOYAmt

Total Assets TotalAssetsGrp

Field	Value	IRS element (for citing)
BOY	$265,240,000	BOYAmt
EOY	$317,202,000	EOYAmt

Accounts Payable Accr Expnss AccountsPayableAccrExpnssGrp

Field	Value	IRS element (for citing)
BOY	$13,736,013	BOYAmt
EOY	$12,573,182	EOYAmt

Deferred Revenue DeferredRevenueGrp

Field	Value	IRS element (for citing)
BOY	$16,435,494	BOYAmt
EOY	$15,379,636	EOYAmt

Tax Exempt Bond Liabilities TaxExemptBondLiabilitiesGrp

Field	Value	IRS element (for citing)
BOY	$28,920,000	BOYAmt
EOY	$28,920,000	EOYAmt

Loans From Officers Directors LoansFromOfficersDirectorsGrp

Field	Value	IRS element (for citing)
BOY	$1,571,313	BOYAmt
EOY	$5,848,564	EOYAmt

Unsecured Notes Loans Payable UnsecuredNotesLoansPayableGrp

Field	Value	IRS element (for citing)
BOY	$7,854,679	BOYAmt
EOY	$29,235,805	EOYAmt

Other Liabilities OtherLiabilitiesGrp

Field	Value	IRS element (for citing)
BOY	$2,119,501	BOYAmt
EOY	$2,056,813	EOYAmt

Total Liabilities TotalLiabilitiesGrp

Field	Value	IRS element (for citing)
BOY	$70,637,000	BOYAmt
EOY	$94,014,000	EOYAmt

Field	Value	IRS element (for citing)
Organization Follows FASB117	Yes (X)	OrganizationFollowsFASB117Ind

No Donor Restriction Net Assets NoDonorRestrictionNetAssetsGrp

Field	Value	IRS element (for citing)
BOY	$150,175,000	BOYAmt
EOY	$152,986,000	EOYAmt

Donor Restriction Net Assets DonorRestrictionNetAssetsGrp

Field	Value	IRS element (for citing)
BOY	$44,428,000	BOYAmt
EOY	$70,202,000	EOYAmt

Total Net Assets Fund Balance TotalNetAssetsFundBalanceGrp

Field	Value	IRS element (for citing)
BOY	$194,603,000	BOYAmt
EOY	$223,188,000	EOYAmt

Tot Liab Net Assets Fund Balance TotLiabNetAssetsFundBalanceGrp

Field	Value	IRS element (for citing)
BOY	$265,240,000	BOYAmt
EOY	$317,202,000	EOYAmt

Field	Value	IRS element (for citing)
Info In Schedule O Part XI	Yes (X)	InfoInScheduleOPartXIInd
Reconcilation Revenue Expnss	$29,610,018	ReconcilationRevenueExpnssAmt
Net Unrlzd Gains Losses Invst	-$69,748	NetUnrlzdGainsLossesInvstAmt
Other Changes In Net Assets	-$955,270	OtherChangesInNetAssetsAmt
Method Of Accounting Accrual	Yes (X)	MethodOfAccountingAccrualInd
Accountant Compile Or Review	false	AccountantCompileOrReviewInd
FS Audited	Yes (true)	FSAuditedInd

FS Audited Basis FSAuditedBasisGrp

Field	Value	IRS element (for citing)
Consol And Sep Basis Fincl Stmt	Yes (X)	ConsolAndSepBasisFinclStmtInd

Field	Value	IRS element (for citing)
Audit Committee	Yes (true)	AuditCommitteeInd
Federal Grant Audit Required	false	FederalGrantAuditRequiredInd

Schedule A IRS990ScheduleA

Field	Value	IRS element (for citing)
Public Organization170	Yes (X)	PublicOrganization170Ind

Gifts Grants Contri Rcvd170 GiftsGrantsContriRcvd170Grp

Field	Value	IRS element (for citing)
Current Tax Year Minus4 Years	$1,851,264	CurrentTaxYearMinus4YearsAmt
Current Tax Year Minus3 Years	$29,624,590	CurrentTaxYearMinus3YearsAmt
Current Tax Year Minus2 Years	$12,543,166	CurrentTaxYearMinus2YearsAmt
Current Tax Year Minus1 Year	$34,054,622	CurrentTaxYearMinus1YearAmt
Current Tax Year	$42,576,514	CurrentTaxYearAmt
Total	$120,650,156	TotalAmt

Tax Rev Levied Orgnztnl Bnft170 TaxRevLeviedOrgnztnlBnft170Grp

Field	Value	IRS element (for citing)
Current Tax Year Minus4 Years	$3,908,169	CurrentTaxYearMinus4YearsAmt
Current Tax Year Minus3 Years	$14,955,352	CurrentTaxYearMinus3YearsAmt
Current Tax Year Minus2 Years	$14,156,721	CurrentTaxYearMinus2YearsAmt
Current Tax Year Minus1 Year	$20,047,681	CurrentTaxYearMinus1YearAmt
Current Tax Year	$19,667,359	CurrentTaxYearAmt
Total	$72,735,282	TotalAmt

Total Calendar Year170 TotalCalendarYear170Grp

Field	Value	IRS element (for citing)
Current Tax Year Minus4 Years	$5,759,433	CurrentTaxYearMinus4YearsAmt
Current Tax Year Minus3 Years	$44,579,942	CurrentTaxYearMinus3YearsAmt
Current Tax Year Minus2 Years	$26,699,887	CurrentTaxYearMinus2YearsAmt
Current Tax Year Minus1 Year	$54,102,303	CurrentTaxYearMinus1YearAmt
Current Tax Year	$62,243,873	CurrentTaxYearAmt
Total	$193,385,438	TotalAmt

Field	Value	IRS element (for citing)
Substantial Contributors Tot	$25,615,695	SubstantialContributorsTotAmt
Public Support Total170	$167,769,743	PublicSupportTotal170Amt

Gross Investment Income170 GrossInvestmentIncome170Grp

Field	Value	IRS element (for citing)
Current Tax Year Minus3 Years	$1,020,225	CurrentTaxYearMinus3YearsAmt
Current Tax Year Minus2 Years	$2,524,043	CurrentTaxYearMinus2YearsAmt
Current Tax Year Minus1 Year	$4,158,999	CurrentTaxYearMinus1YearAmt
Current Tax Year	$4,001,392	CurrentTaxYearAmt
Total	$11,704,659	TotalAmt

Unrelated Business Net Incm170 UnrelatedBusinessNetIncm170Grp

Field	Value	IRS element (for citing)
Current Tax Year Minus4 Years	$9,196	CurrentTaxYearMinus4YearsAmt
Current Tax Year Minus2 Years	$13,678	CurrentTaxYearMinus2YearsAmt
Current Tax Year Minus1 Year	$30,521	CurrentTaxYearMinus1YearAmt
Current Tax Year	$64,544	CurrentTaxYearAmt
Total	$117,939	TotalAmt

Field	Value	IRS element (for citing)
Total Support	$205,208,036	TotalSupportAmt
Gross Receipts Rltd Activities	$147,631,209	GrossReceiptsRltdActivitiesAmt
Public Support CY170	0.81760	PublicSupportCY170Pct
Public Support PY170	0.90590	PublicSupportPY170Pct
Thirty Thr Pct Suprt Tests CY170	Yes (X)	ThirtyThrPctSuprtTestsCY170Ind
Facts And Circumstances Test	Part II Section A Line 1-4 The 2020 amounts reflect the short year period from 1/1/21-3/31/21 due a change in accounting period.	FactsAndCircumstancesTestTxt

Form990 Schedule A Part VI Form990ScheduleAPartVIGrp

Field	Value	IRS element (for citing)
Form And Line Reference	Part II Section B Line 7-10	FormAndLineReferenceDesc
Explanation	The 2020 amounts reflect the short year period from 1/1/21-3/31/21 due a change in accounting period.	ExplanationTxt

Schedule B IRS990ScheduleB

Contributor Information ContributorInformationGrp

Field	Value	IRS element (for citing)
Contributor	RESTRICTED	ContributorNum

Contributor Business Name ContributorBusinessName

Field	Value	IRS element (for citing)
Business Name Line1	RESTRICTED	BusinessNameLine1

Contributor US Address ContributorUSAddress

Field	Value	IRS element (for citing)
Address Line1	RESTRICTED	AddressLine1
Address Line2	RESTRICTED	AddressLine2
City	RESTRICTED	City
State	RESTRICTED	State
ZIP Code	RESTRICTED	ZIPCode

Field	Value	IRS element (for citing)
Total Contributions	RESTRICTED	TotalContributionsAmt

Schedule C IRS990ScheduleC

Field	Value	IRS element (for citing)
Volunteers	false	VolunteersInd
Paid Staff Or Management	Yes (true)	PaidStaffOrManagementInd
Media Advertisements	false	MediaAdvertisementsInd
Mailings Members	false	MailingsMembersInd
Publications Or Broadcast	false	PublicationsOrBroadcastInd
Grants Other Organizations	false	GrantsOtherOrganizationsInd
Direct Contact Legislators	Yes (true)	DirectContactLegislatorsInd
Direct Contact Legislators	$78,685	DirectContactLegislatorsAmt
Rallies Demonstrations	false	RalliesDemonstrationsInd
Other Activities	false	OtherActivitiesInd
Total Lobbying Expenditures	$78,685	TotalLobbyingExpendituresAmt
Not Described Section501c3	false	NotDescribedSection501c3Ind

Supplemental Information Detail SupplementalInformationDetail

Field	Value	IRS element (for citing)
Form And Line Reference	II-B 1 A-J	FormAndLineReferenceDesc
Explanation	The Chicago Zoological Society is a private non profit organization that operates Brookfield Zoo Chicago on land owned by the Forest Preserve District of Cook County. Brookfield Zoo Chicago was created through an act of the Illinois Legislature and the Society annually receives partial funding from the Cook County Forest Preserves to maintain and operate the Zoo. Occasionally, the laws and regulations under which the Society was organized and is funded and operated require updating. The Society may advise and assist appropriate legislative bodies in this activity. It may also advocate for the adoption or rejection of legislation. By virtue of a management agreement with the District, the Society is periodically called upon to advise on matters of public policy. The Society also employs certain staff and consultants to communicate with the State of Illinois, federal officials, county commissioners and other government officials, to inform those parties of the activities of the Society. Additionally, as required during the year, the Societys President and designated staff attend national and international professional group meetings and otherwise communicate with those groups on various matters, including the expression of opinions to appropriate congressional representatives, congressional committees or other deliberative bodies that influence public policy concerning species in danger of extinction, environmental management, the biological sciences and kindred subject, and federal regulatory agency activities affecting wildlife and its management. Also, as needed from time to time, the Society may contact its members, staff and volunteers to encourage them to express their views on pending legislation that may have a direct impact on the Society and its conservation programs.	ExplanationTxt

Schedule D IRS990ScheduleD

Field	Value	IRS element (for citing)
Funds And Other Accounts Held	2	FundsAndOtherAccountsHeldCnt
Funds And Other Accounts Contri	$641,045	FundsAndOtherAccountsContriAmt
Funds And Other Accounts Grants	$469,644	FundsAndOtherAccountsGrantsAmt
Funds And Other Accounts Vl EOY	$3,564,903	FundsAndOtherAccountsVlEOYAmt
Disclosed Org Leg Ctrl	false	DisclosedOrgLegCtrlInd
Disclosed For Charitable Prps	false	DisclosedForCharitablePrpsInd
Collection Used Pub Exhibition	Yes (X)	CollectionUsedPubExhibitionInd
Coll Used Scholarly Rsrch	Yes (X)	CollUsedScholarlyRsrchInd
Collection Used Preservation	Yes (X)	CollectionUsedPreservationInd
Coll Used Loan Or Exch Prog	Yes (X)	CollUsedLoanOrExchProgInd
Solicited Assets Sale	false	SolicitedAssetsSaleInd

CY Endwmt Fund CYEndwmtFundGrp

Field	Value	IRS element (for citing)
Beginning Year Balance	$26,355,000	BeginningYearBalanceAmt
Contributions	$497,000	ContributionsAmt
Investment Earnings Or Losses	$1,497,000	InvestmentEarningsOrLossesAmt
Other Expenditures	$928,000	OtherExpendituresAmt
Administrative Expenses	$55,000	AdministrativeExpensesAmt
End Year Balance	$27,366,000	EndYearBalanceAmt

CY Minus1 Yr Endwmt Fund CYMinus1YrEndwmtFundGrp

Field	Value	IRS element (for citing)
Beginning Year Balance	$23,275,000	BeginningYearBalanceAmt
Contributions	$134,000	ContributionsAmt
Investment Earnings Or Losses	$3,834,000	InvestmentEarningsOrLossesAmt
Other Expenditures	$839,000	OtherExpendituresAmt
Administrative Expenses	$49,000	AdministrativeExpensesAmt
End Year Balance	$26,355,000	EndYearBalanceAmt

CY Minus2 Yr Endwmt Fund CYMinus2YrEndwmtFundGrp

Field	Value	IRS element (for citing)
Beginning Year Balance	$24,740,000	BeginningYearBalanceAmt
Contributions	$3,000	ContributionsAmt
Investment Earnings Or Losses	-$1,419,000	InvestmentEarningsOrLossesAmt
Other Expenditures	$5,000	OtherExpendituresAmt
Administrative Expenses	$44,000	AdministrativeExpensesAmt
End Year Balance	$23,275,000	EndYearBalanceAmt

CY Minus3 Yr Endwmt Fund CYMinus3YrEndwmtFundGrp

Field	Value	IRS element (for citing)
Beginning Year Balance	$25,383,000	BeginningYearBalanceAmt
Contributions	$28,000	ContributionsAmt
Investment Earnings Or Losses	$256,000	InvestmentEarningsOrLossesAmt
Other Expenditures	$874,000	OtherExpendituresAmt
Administrative Expenses	$53,000	AdministrativeExpensesAmt
End Year Balance	$24,740,000	EndYearBalanceAmt

CY Minus4 Yr Endwmt Fund CYMinus4YrEndwmtFundGrp

Field	Value	IRS element (for citing)
Beginning Year Balance	$24,562,000	BeginningYearBalanceAmt
Contributions	$3,000	ContributionsAmt
Investment Earnings Or Losses	$831,000	InvestmentEarningsOrLossesAmt
Administrative Expenses	$13,000	AdministrativeExpensesAmt
End Year Balance	$25,383,000	EndYearBalanceAmt

Field	Value	IRS element (for citing)
Board Designated Balance EOY	0.22000	BoardDesignatedBalanceEOYPct
Prmnnt Endowment Balance EOY	0.40000	PrmnntEndowmentBalanceEOYPct
Term Endowment Balance EOY	0.38000	TermEndowmentBalanceEOYPct
Endowments Held Unrelated Org	Yes (true)	EndowmentsHeldUnrelatedOrgInd
Endowments Held Related Org	false	EndowmentsHeldRelatedOrgInd

Leasehold Improvements LeaseholdImprovementsGrp

Field	Value	IRS element (for citing)
Other Cost Or Other Basis	$292,781,306	OtherCostOrOtherBasisAmt
Depreciation	$186,983,811	DepreciationAmt
Book Value	$105,797,495	BookValueAmt

Equipment EquipmentGrp

Field	Value	IRS element (for citing)
Other Cost Or Other Basis	$11,824,560	OtherCostOrOtherBasisAmt
Depreciation	$8,951,942	DepreciationAmt
Book Value	$2,872,618	BookValueAmt

Other Land Buildings OtherLandBuildingsGrp

Field	Value	IRS element (for citing)
Other Cost Or Other Basis	$64,868,245	OtherCostOrOtherBasisAmt
Book Value	$64,868,245	BookValueAmt

Field	Value	IRS element (for citing)
Total Book Value Land Buildings	$173,538,358	TotalBookValueLandBuildingsAmt

Other Securities OtherSecuritiesGrp (2 entries)

DescDesc
Financial derivatives and other financial products
Closely-held equity interests

Other Liabilities Org OtherLiabilitiesOrgGrp (7 entries)

DescDesc	AmtAmt
Federal income taxes
Accrued Post Retirement Benefit Obligation	$948,412
Accrued Sick Pay Benefit Obligation	$787,757
457f Employee Benefit Obligation	$277,186
Charitable Gift Annuity Obligation	$139,554
Unamortized Bond Issue Costs	-$96,408
Other	$312

Field	Value	IRS element (for citing)
Total Liability	$2,056,813	TotalLiabilityAmt
Footnote Text	Yes (X)	FootnoteTextInd
Total Rev Etc Audited Fincl Stmt	$108,972,000	TotalRevEtcAuditedFinclStmtAmt
Net Unrealized Gains Invst	-$69,748	NetUnrealizedGainsInvstAmt
Donated Services And Use Fclts	$490,366	DonatedServicesAndUseFcltsAmt
Revenue Not Reported	$420,618	RevenueNotReportedAmt
Revenue Subtotal	$108,551,382	RevenueSubtotalAmt
Investment Expenses Not Incld	$143,606	InvestmentExpensesNotIncldAmt
Other Revenues Not Included	-$705,373	OtherRevenuesNotIncludedAmt
Revenue Not Reported Fincl Stmt	-$561,767	RevenueNotReportedFinclStmtAmt
Total Revenue Per Form990	$107,989,615	TotalRevenuePerForm990Amt
Tot Expns Etc Audited Fincl Stmt	$79,571,000	TotExpnsEtcAuditedFinclStmtAmt
Donated Services Use Fclts	$490,366	DonatedServicesUseFcltsAmt
Other Expenses Included	$844,643	OtherExpensesIncludedAmt
Expenses Not Reported	$1,335,009	ExpensesNotReportedAmt
Expenses Subtotal	$78,235,991	ExpensesSubtotalAmt
Investment Expenses Not Incld2	$143,606	InvestmentExpensesNotIncld2Amt
Expenses Not Rpt Fincl Stmt	$143,606	ExpensesNotRptFinclStmtAmt
Total Expenses Per Form990	$78,379,597	TotalExpensesPerForm990Amt

Supplemental Information Detail SupplementalInformationDetail (8 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
I 5 and 6	The Society does not maintain any donor advised funds. Other Funds consist of the Chicago Board of Trade Endangered Species Fund and the CZS Womens Board Fund. Contributions to these funds come from donors as well as proceeds from fundraising events and investment income. Grants are decided by committees as described in Schedule I. At times, donors who have given money to the fund may also sit on the granting committee but no one donor may decide on the grant awards. All grants awarded must follow the guidelines and processes established by CZS. CZS Board of Trustees has final approval of all Chicago Board of Trade Endangered Species Fund Committee recommended grant awards. CZS Management has final approval of all CZS Womens Board recommended grant awards.
III 1A	Animal Collections, which were acquired through breeding loans, purchases and contributions, are not recognized as assets on the Statement of Financial Position. Costs to acquire collection items are recorded as decreases in unrestricted net assets in the year in which the animals are acquired. Proceeds from deaccessions are reflected as increases in the appropriate net asset class. The Societys animal collection consists of specimens with numerous attributes including taxonomic group, age, sex, relationship and value to other animals, endangered status and breeding potential. The Society retains a record of every animal in a permanent file. An inventory of the collection is prepared annually. Professionally trained keeper staff and population managers provide daily care for the collection and determine population needs.
III 4	The more than 2500 ambassadors of the animal kingdom which make up the CZS collection provide our visitors a rare opportunity to see species from around the globe. The collection, in connection with our education programs, provides CZS the opportunity to teach guests about animals and nature, conservation and other related topics.
V 4	The Societys endowment consists of different funds established to support a variety of CZS programs including conservation and research, education and outreach, care of the animal collection and grounds, and general operations. Additionally, the Society is the designated beneficiary of the interest income on a 1 million endowment established and maintained by the Chicago Community Trust. The CCT maintains variance power over this endowment and, accordingly, the Society has not included it in its financial statements.
VI 1A-E	The Society operates a zoological park on land owned by the Forest Preserve District of Cook County, IL which is provided to the Society at no charge. The land site of the Zoo, accordingly, is not recorded on the Societys financial statements. All park improvements acquired by the Society are legally owned by the District. All park improvements acquired by the Society, including those acquired with District funds, are recorded as park improvements on the Societys financial statements. The amount in Other represents construction in progress on capital assets. Once a capital asset is complete and in use, the total amount for that project is closed out of construction in progress and transferred to park improvements.
X 2	The Society is a not-for-profit corporation and is exempt from tax under the provisions of Internal Revenue Code Section 501c3, except for taxes on unrelated business income. The Society has no liability for uncertain tax positions, therefore the Society does not include such a footnote as it is no longer required by generally accepted accounting principles.
XI 4b	Other Adjustments - Fundraising Event Expense -694,691 Rounding and Misc adjustments -10,682
XII 2d	Other Adjustments - change in market value of swap agreements 141,172, Fundraising Event Expense 694,691 Rounding and Misc adjustments 8780

Schedule F IRS990ScheduleF

Field	Value	IRS element (for citing)
Grant Records Maintained	Yes (true)	GrantRecordsMaintainedInd

Account Activities Outside US AccountActivitiesOutsideUSGrp (14 entries)

RegionRegionTxt	Type Of Activities ConductedTypeOfActivitiesConductedTxt	Region Total ExpendituresRegionTotalExpendituresAmt	Specific Services ProvidedSpecificServicesProvidedTxt
Central America and the Caribbean	grants to recipients for fieldwork in the region	$7,000
East Asia and the Pacific	grants to recipients for fieldwork in the region	$5,800
East Asia and the Pacific	program services	$15,545	attend conservation related conferences
Europe Including Iceland and Greenland	grants to recipients for fieldwork in the region	$7,000
Europe Including Iceland and Greenland	program services	$1,211	attend conservation related conferences
Europe Including Iceland and Greenland	program services	$21,950	exhibit benchmarking
Europe Including Iceland and Greenland	program services	$29,635	memberships in conservation organizations
North America	program services	$86,436	attend conservation related conferences
South America	grants to recipients for fieldwork in the region	$33,547
South America	program services	$17,174	conservation fieldwork
South Asia	grants to recipients for fieldwork in the region	$5,910
Sub-Saharan Africa	program services	$13,186	conservation education
Sub-Saharan Africa	grants to recipients for fieldwork in the region	$46,011
Sub-Saharan Africa	program services	$5,651	conservation fieldwork

Field	Value	IRS element (for citing)
Subtotal Spent	$296,056	SubtotalSpentAmt
Total Spent	$296,056	TotalSpentAmt

Grants To Org Outside US GrantsToOrgOutsideUSGrp (6 entries)

RegionRegionTxt	Purpose Of GrantPurposeOfGrantTxt	Cash GrantCashGrantAmt	Manner Of Cash DisbursementMannerOfCashDisbursementTxt
East Asia and the Pacific	Conservation Fieldwork	$5,800	WT
Europe Including Iceland and Greenland	Conservation Fieldwork	$7,000	WT
Sub-Saharan Africa	Conservation Fieldwork	$7,000	check
Central America and the Caribbean	Conservation Fieldwork	$7,000	check
South America	Conservation Fieldwork	$22,047	check
South America	Conservation Fieldwork	$6,500	check

Field	Value	IRS element (for citing)
Total501c3 Org	6	Total501c3OrgCnt

Foreign Individuals Grants ForeignIndividualsGrantsGrp (3 entries)

Type Of AssistanceTypeOfAssistanceTxt	RegionRegionTxt	RecipientRecipientCnt	Cash GrantCashGrantAmt	Manner Of Cash DisbursementMannerOfCashDisbursementTxt
Conservation Fieldwork	Sub-Saharan Africa	5	$25,551	Wire Transfer
Conservation Fieldwork	Sub-Saharan Africa	2	$13,460	check
Conservation Fieldwork	South Asia	1	$5,910	Wire Transfer

Field	Value	IRS element (for citing)
Transfer To Foreign Corp	false	TransferToForeignCorpInd
Interest In Foreign Trust	false	InterestInForeignTrustInd
Foreign Corp Ownership	false	ForeignCorpOwnershipInd
Passive Foreign Investmest Co	false	PassiveForeignInvestmestCoInd
Foreign Partnership	false	ForeignPartnershipInd
Boycott Countries	false	BoycottCountriesInd

Supplemental Information Detail SupplementalInformationDetail (3 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
Part I Line 2	The Society awards grants through its Chicago Board of Trade Endangered Species Fund CBT ESF. Grant proposals are reviewed by a team of three. Proposals may be endorsed by an IUCN Species Survival Committee or other major, internationally known conservation organization, the AZA/WAZA, or other major zoo organization. For any individuals/organizations who are not US Citizens/entities, the Society checks the most recent OFAC Control List of Specifically Designated and Blocked Persons as well as the Consolidated List established and maintained by the 1267 Committee with respect to Al-Qaida, Osama Bin Laden, and the Taliban and other individuals, groups, undertakings and entities associated with them. Approximately 100k is awarded each year, usually in amounts of 5000 to 7000 per grant. Final award recommendations are presented to the Board of Trustees by the CBOT Advisory Committee members. Final reports are due 1 year after the receipt of the funds along with a final accounting of the grant funds expended. In addition, other grant funds are given by the Society to major, internationally known conservation organizations in support of their general conservation mission. These contributions are determined by Society management. They are approved by the Board either as part of the annual operating budget process or as part of a periodic spending authorization from the Societys Board Designated Conservation Fund.
Part I Line 2 contd	The Society also holds funds raised for pangolin conservation programs. A small number of research grants are awarded from these funds each year. The grants awarded from these funds are approved by the Pangolin Consortium Group. This group is composed of staff from the Society and other like-minded institutions. The group has written grant application, awarding, tracking and reporting processes in place. All grant payments approved by the group must follow the Societys established internal procedures before payment is made.
Part I Line 3, Col F	, Part II Line 1, and Part III All expenditures are reported using the accrual method of accounting.

Schedule G IRS990ScheduleG

Field	Value	IRS element (for citing)
Mail Solicitations	Yes (X)	MailSolicitationsInd
Email Solicitations	Yes (X)	EmailSolicitationsInd
Phone Solicitations	Yes (X)	PhoneSolicitationsInd
In Person Solicitations	Yes (X)	InPersonSolicitationsInd
Solicitation Of Non Govt Grants	Yes (X)	SolicitationOfNonGovtGrantsInd
Solicitation Of Govt Grants	Yes (X)	SolicitationOfGovtGrantsInd
Special Fundraising Events	Yes (X)	SpecialFundraisingEventsInd
Agrmt Prof Fundraising Acty	Yes (true)	AgrmtProfFundraisingActyInd

Fundraiser Activity Info FundraiserActivityInfoGrp (3 entries)

Address Line1USAddress/AddressLine1Txt	CityUSAddress/CityNm	State AbbreviationUSAddress/StateAbbreviationCd	ZIPUSAddress/ZIPCd	ActivityActivityTxt	Fundraiser Control Of FundsFundraiserControlOfFundsInd	Retained By ContractorRetainedByContractorAmt
Community Counselling Service Co LLC
527 Madison Ave Fifth Floor	New York	NY	10022	fundraising consulting	false	$197,375
Miles River Direct
19 Boardman Lane	Hamilton	MA	01982	fundraising consulting	false	$11,000
Virtual Marketing LLC
222 Merchandise Mart Plaza Ste 2200	Chicago	IL	60654	fundraising consulting	false	$10,000

Field	Value	IRS element (for citing)
Total Retained By Contractors	$218,375	TotalRetainedByContractorsAmt
Licensed States	FL	LicensedStatesCd
Licensed States	IL	LicensedStatesCd
Licensed States	IN	LicensedStatesCd
Licensed States	WI	LicensedStatesCd

Fundraising Event Information FundraisingEventInformationGrp

Field	Value	IRS element (for citing)
Event1	Whirl Gala	Event1Nm
Gross Receipts Event1	$1,535,924	GrossReceiptsEvent1Amt
Charitable Contri Event1	$1,413,424	CharitableContriEvent1Amt
Gross Revenue Event1	$122,500	GrossRevenueEvent1Amt
Rent Facility Costs Event1	$56,012	RentFacilityCostsEvent1Amt
Food And Beverage Event1	$166,301	FoodAndBeverageEvent1Amt
Entertainment Event1	$14,000	EntertainmentEvent1Amt
Other Direct Expenses Event1	$187,539	OtherDirectExpensesEvent1Amt
Event2	Conservation Leadership Awards Dinner	Event2Nm
Gross Receipts Event2	$321,600	GrossReceiptsEvent2Amt
Charitable Contri Event2	$297,250	CharitableContriEvent2Amt
Gross Revenue Event2	$24,350	GrossRevenueEvent2Amt
Rent Facility Costs Event2	$16,712	RentFacilityCostsEvent2Amt
Food And Beverage Event2	$72,235	FoodAndBeverageEvent2Amt
Other Direct Expenses Event2	$34,448	OtherDirectExpensesEvent2Amt
Other Events Total	4	OtherEventsTotalCnt
Gross Receipts Other Events	$309,100	GrossReceiptsOtherEventsAmt
Charitable Contri Other Events	$253,685	CharitableContriOtherEventsAmt
Gross Revenue Other Events	$55,415	GrossRevenueOtherEventsAmt
Rent Fclty Costs Other Events	$6,317	RentFcltyCostsOtherEventsAmt
Food And Beverage Other Events	$83,495	FoodAndBeverageOtherEventsAmt
Oth Direct Expnss Other Events	$101,521	OthDirectExpnssOtherEventsAmt
Gross Receipts Total	$2,166,624	GrossReceiptsTotalAmt
Charitable Contributions Tot	$1,964,359	CharitableContributionsTotAmt
Gross Revenue Total Events	$202,265	GrossRevenueTotalEventsAmt
Rent Fclty Costs Total Events	$79,041	RentFcltyCostsTotalEventsAmt
Food And Beverage Total Events	$322,031	FoodAndBeverageTotalEventsAmt
Entertainment Total Events	$14,000	EntertainmentTotalEventsAmt
Oth Direct Expnss Total Events	$323,508	OthDirectExpnssTotalEventsAmt
Direct Expense Summary Events	$738,580	DirectExpenseSummaryEventsAmt
Net Income Summary	-$536,315	NetIncomeSummaryAmt

Gaming Information GamingInformationGrp

Field	Value	IRS element (for citing)
Gross Revenue Other Gaming	$42,433	GrossRevenueOtherGamingAmt
Cash Prizes Other Gaming	$3,000	CashPrizesOtherGamingAmt
Non Cash Prizes Other Gaming	$6,776	NonCashPrizesOtherGamingAmt
Volunteer Labor Other Gaming	Yes (true)	VolunteerLaborOtherGamingInd
Volunteer Labor Other Gaming	0.33000	VolunteerLaborOtherGamingPct
Gross Revenue Total Gaming	$42,433	GrossRevenueTotalGamingAmt
Cash Prizes Total Gaming	$3,000	CashPrizesTotalGamingAmt
Non Cash Prizes Total Gaming	$6,776	NonCashPrizesTotalGamingAmt
Direct Expense Summary Gaming	$9,776	DirectExpenseSummaryGamingAmt
Net Gaming Income Summary	$32,657	NetGamingIncomeSummaryAmt

Field	Value	IRS element (for citing)
Licensed	Yes (true)	LicensedInd
License Suspended Etc	false	LicenseSuspendedEtcInd
Gaming With Nonmembers	Yes (true)	GamingWithNonmembersInd
Member Of Other Entity	false	MemberOfOtherEntityInd
Gaming Own Facility	0.50000	GamingOwnFacilityPct
Gaming Other Facility	0.50000	GamingOtherFacilityPct
Individual With Books	H Bilcer	IndividualWithBooksNm

Persons With Books US Address PersonsWithBooksUSAddress

Field	Value	IRS element (for citing)
Address Line1	3300 Golf Road	AddressLine1Txt
City	Brookfield	CityNm
State Abbreviation	IL	StateAbbreviationCd
ZIP	60513	ZIPCd

Field	Value	IRS element (for citing)
Cntrct With3rd Prty For Game Rev	false	CntrctWith3rdPrtyForGameRevInd
Gaming Manager Person	C Brueggemann	GamingManagerPersonNm
Gaming Manager Compensation	$899	GamingManagerCompensationAmt
Gaming Manager Services Prov	As Sr. VP of Development, Ms. Brueggemann spent a small portion of her time supervising raffles.	GamingManagerServicesProvTxt
Gaming Manager Is Employee	Yes (X)	GamingManagerIsEmployeeInd
Charitable Distribution Rqr	false	CharitableDistributionRqrInd

Schedule I IRS990ScheduleI

Field	Value	IRS element (for citing)
Grant Records Maintained	Yes (true)	GrantRecordsMaintainedInd

Recipient Table RecipientTable (2 entries)

Address Line1USAddress/AddressLine1Txt	CityUSAddress/CityNm	State AbbreviationUSAddress/StateAbbreviationCd	ZIPUSAddress/ZIPCd	Recipient EINRecipientEIN	IRC SectionIRCSectionDesc	Cash GrantCashGrantAmt	Purpose Of GrantPurposeOfGrantTxt
The Biodiversity Group
10980 Rudasill Rd	Tucson	AZ	85743	203091062	501c3	$6,500	Pangolin Conservation
Pangolin Conseravtion and Research Foundation
21095 State Rt 245	Marysville	OH	43040	920508206	501c3	$17,000	Pangolin Conservation

Field	Value	IRS element (for citing)
Total501c3 Org	2	Total501c3OrgCnt

Grants Other Asst To Indiv In US GrantsOtherAsstToIndivInUSGrp (2 entries)

Grant TypeGrantTypeTxt	RecipientRecipientCnt	Cash GrantCashGrantAmt
Educ. Scholarship for Conservation Education	6	$30,000
Conservation Leadership Award	1	$2,500

Supplemental Information Detail SupplementalInformationDetail

Field	Value	IRS element (for citing)
Form And Line Reference	Part I Line 2	FormAndLineReferenceDesc
Explanation	CZS awards grants and assistance through a variety of programs. For awards under the CBT ESF and Pangolin Conservation Programs, as well as general contributions to major conservation organizations, see details in Schedule F, part V. CZS also provides grants and assistance through its educational scholarship programs. CZS maintains records to substantiate amounts, elegibility and selection criteria. Procedures are in place to monitor grants to ensure they are used for proper purposes including, where applicable, periodic reporting by the grantee.	ExplanationTxt

Schedule J IRS990ScheduleJ

Field	Value	IRS element (for citing)
Idemnification Gross Up Pmts	Yes (X)	IdemnificationGrossUpPmtsInd
Housing Allowance Or Residence	Yes (X)	HousingAllowanceOrResidenceInd
Club Dues Or Fees	Yes (X)	ClubDuesOrFeesInd
Written Policy Ref T And E Expnss	Yes (true)	WrittenPolicyRefTAndEExpnssInd
Substantiation Required	Yes (true)	SubstantiationRequiredInd
Compensation Committee	Yes (X)	CompensationCommitteeInd
Independent Consultant	Yes (X)	IndependentConsultantInd
Form990 Of Other Organizations	Yes (X)	Form990OfOtherOrganizationsInd
Compensation Survey	Yes (X)	CompensationSurveyInd
Board Or Committee Approval	Yes (X)	BoardOrCommitteeApprovalInd
Severance Payment	false	SeverancePaymentInd
Supplemental Nonqual Rtr Plan	Yes (true)	SupplementalNonqualRtrPlanInd
Equity Based Comp Arrngm	false	EquityBasedCompArrngmInd
Comp Based On Revenue Of Flng Org	false	CompBasedOnRevenueOfFlngOrgInd
Comp Bsd On Rev Related Orgs	false	CompBsdOnRevRelatedOrgsInd
Comp Bsd Net Earns Flng Org	false	CompBsdNetEarnsFlngOrgInd
Comp Bsd Net Earns Rltd Orgs	false	CompBsdNetEarnsRltdOrgsInd
Any Non Fixed Payments	Yes (true)	AnyNonFixedPaymentsInd
Initial Contract Exception	false	InitialContractExceptionInd

Rltd Org Officer Trst Key Empl RltdOrgOfficerTrstKeyEmplGrp (12 entries)

TitleTitleTxt	Base Compensation Filing OrgBaseCompensationFilingOrgAmt	Bonus Filing OrganizationBonusFilingOrganizationAmount	Other Compensation Filing OrgOtherCompensationFilingOrgAmt	Deferred Compensation Flng OrgDeferredCompensationFlngOrgAmt	Nontaxable Benefits Filing OrgNontaxableBenefitsFilingOrgAmt	Total Compensation Filing OrgTotalCompensationFilingOrgAmt
Dr Michael Adkesson
President and CEO	$580,728	$60,000	$52,130	$65,254	$39,299	$797,411
David E Burns
Chief Financial and Admin. Officer	$374,481	$10,000	$4,384	$56,923	$26,486	$472,274
Cathleen Brueggemann
Sr. VP Development	$311,826	$5,000	$787	$35,571	$11,691	$364,875
Andrea S Rodgers
Sr. VP Guest Experience Operations	$244,569		$241	$21,778	$11,155	$277,743
Jennifer L Baader
Sr. VP Govt Affairs	$235,908		$208	$5,442	$25,553	$267,111
Sandra L Dornhecker
Sr. VP Human Resources	$215,442		$10,298	$3,201	$25,410	$254,351
Dr Sathya K Chinnadurai
Sr. VP Animal Health Welfare	$214,186		$319	$6,632	$37,883	$259,020
Heather Bilcer
VP Finance	$193,263		$1,797	$4,688	$1,552	$201,300
Randall Wells
VP Marine Mammal Conservation	$183,259		$10,912	$3,988	$25,027	$223,186
Melissa Lewkowich
VP Risk Facilities Mgmt	$185,547		$901	$5,750	$25,340	$217,538
Shannon Heston
VP Information Technology	$181,687		$184	$1,369	$37,697	$220,937
Jerome E Johnston
VP Guest Services Operations	$139,140		$38,335	$5,302	$5,666	$188,443

Supplemental Information Detail SupplementalInformationDetail (4 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
Part I Line Line 1a	As provided for in the executive employment agreement approved by the Board of Trustees, the President received a housing allowance and a gross up payment equivalent to the tax obligation for the value of the Society provided life insurance. Both were treated as taxable compensation to the President.
Part I Line Line 1a	The Society paid for Chicago Club and Economic Club of Chicago dues for the President. These organizations were only used for business purposes and were not treated as taxable compensation.
Part I Line Line 4b	The Society has a non qualified 457f Plan for select management employees. As approved by the Board of Trustees, deferred contributions were credited to the Plan during fiscal year 2025 on behalf of the President, the Chief Financial and Admin Officer, the Sr. VP of Development and the Sr. VP Guest Experience and Operations totaling 157,500. Employer contributions and related earnings and losses vest under a rolling 3 year vesting option, vesting on the first day of the 3rd plan year beginning after the plan year during which each employer contribution credit was made, or upon the participants death or long-term disability. Prior to vesting, all benefits are subject to risk of forfeiture.
Part I Line Line 7	As indicated in Schedule J part II, certain individuals received bonuses based on performance. All bonuses were approved by the Board of Trustees.

Schedule K IRS990ScheduleK

Tax Exempt Bonds Issues TaxExemptBondsIssuesGrp

Field	Value	IRS element (for citing)
Bond Reference	A	BondReferenceCd

Issuer Name IssuerName

Field	Value	IRS element (for citing)
Business Name Line1	Village of Brookfield Cook County IL	BusinessNameLine1Txt

Field	Value	IRS element (for citing)
Bond Issuer EIN	366005807	BondIssuerEIN
CUSIP	112732AAO	CUSIPNum
Bond Issued	2008-06-18	BondIssuedDt
Issue Price	$39,850,000	IssuePriceAmt
Purpose	Construction and renovation of certain buildings and exhibits	PurposeDesc
Defeased	false	DefeasedInd
On Behalf Of Issuer	false	OnBehalfOfIssuerInd
Pool Financing	false	PoolFinancingInd

Tax Exempt Bonds Proceeds TaxExemptBondsProceedsGrp

Field	Value	IRS element (for citing)
Bond Reference	A	BondReferenceCd
Retired	$10,930,000	RetiredAmt
Total Proceeds	$39,850,000	TotalProceedsAmt
Capitalized Interest	$595,445	CapitalizedInterestAmt
Issuance Costs From Proceeds	$296,598	IssuanceCostsFromProceedsAmt
Capital Expenditures	$30,539,559	CapitalExpendituresAmt
Other Spent Proceeds	$8,418,398	OtherSpentProceedsAmt
Substantial Completion	2010	SubstantialCompletionYr
Refunding Tax Exempt Bonds	false	RefundingTaxExemptBondsInd
Refunding Taxable Bonds	false	RefundingTaxableBondsInd
Final Allocation Made	Yes (true)	FinalAllocationMadeInd
Adequate Books And Rec Maint	Yes (true)	AdequateBooksAndRecMaintInd

Tax Exempt Bonds Private Bus Use TaxExemptBondsPrivateBusUseGrp

Field	Value	IRS element (for citing)
Bond Reference	A	BondReferenceCd
Owning Bond Financed Property	false	OwningBondFinancedPropertyInd
Any Lease Arrangements	false	AnyLeaseArrangementsInd
Mgmt Contract Bond Fincd Prop	false	MgmtContractBondFincdPropInd
Any Research Agreements	false	AnyResearchAgreementsInd
Bond Iss Meet Prvt Sec Pymt Test	false	BondIssMeetPrvtSecPymtTestInd
Change In Use Bond Financed Prop	false	ChangeInUseBondFinancedPropInd
Procs Nonqualified Bond Remdtd	Yes (true)	ProcsNonqualifiedBondRemdtdInd

Tax Exempt Bonds Arbitrage TaxExemptBondsArbitrageGrp

Field	Value	IRS element (for citing)
Bond Reference	A	BondReferenceCd
Form8038 T Filed	false	Form8038TFiledInd
No Rebate Due	Yes (true)	NoRebateDueInd
Variable Rate Issue	Yes (true)	VariableRateIssueInd
Hedge Identified In Bks And Rec	Yes (true)	HedgeIdentifiedInBksAndRecInd

Hedge Provider Name HedgeProviderName

Field	Value	IRS element (for citing)
Business Name Line1	The Northern Trust Co	BusinessNameLine1Txt

Field	Value	IRS element (for citing)
Term Of Hedge	0000000010.000000000000	TermOfHedgePct
Superintegrated Hedge	false	SuperintegratedHedgeInd
Hedge Terminated	false	HedgeTerminatedInd
Gross Proceeds Invested In GIC	false	GrossProceedsInvestedInGICInd
Gross Proceeds Invested	false	GrossProceedsInvestedInd
Written Proc To Monitor Reqs	Yes (true)	WrittenProcToMonitorReqsInd

Procedures Corrective Action ProceduresCorrectiveActionGrp

Field	Value	IRS element (for citing)
Bond Reference	A	BondReferenceCd
Procedures Corrective Action	Yes (true)	ProceduresCorrectiveActionInd

Supplemental Information Detail SupplementalInformationDetail (3 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
Part II Line 1A	Some proceeds of the bonds were used to retire a portion of the bonds as reported in Part II, Line 1A
Part IV Line 2c	Column A The rebate calculation was performed by an independent rebate consultant in March 2013 indicating no rebate was due and advising that as long as all assumptions remained true it was no longer necessary to compute excess with respect to these bonds.
Part II Line 11A	Proceeds used for partial early redemption of bond issue.

Schedule L IRS990ScheduleL

Loans Btwn Org Interested Prsn LoansBtwnOrgInterestedPrsnGrp

Business Name BusinessName

Field	Value	IRS element (for citing)
Business Name Line1	Jay BergmanFirst Secure Bank & Trust Co	BusinessNameLine1Txt

Field	Value	IRS element (for citing)
Relationship With Org	Trustee	RelationshipWithOrgTxt
Loan Purpose	Construction	LoanPurposeTxt
Loan To Organization	Yes (X)	LoanToOrganizationInd
Original Principal	$5,848,564	OriginalPrincipalAmt
Balance Due	$5,848,564	BalanceDueAmt
Default	false	DefaultInd
Board Or Committee Approval	Yes (true)	BoardOrCommitteeApprovalInd
Written Agreement	Yes (true)	WrittenAgreementInd

Field	Value	IRS element (for citing)
Total Balance Due	$5,848,564	TotalBalanceDueAmt

Bus Tr Involve Interested Prsn BusTrInvolveInterestedPrsnGrp (2 entries)

Relationship DescriptionRelationshipDescriptionTxt	TransactionTransactionAmt	TransactionTransactionDesc	Sharing Of RevenuesSharingOfRevenuesInd
Jay Bergman
Trustee	$259,853	Loan Interest	false
Stan Pepper
Trustee	$32,037,981	Construction contracts	false

Supplemental Information Detail SupplementalInformationDetail (3 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
Part II Line 1	Mr. Bergman, a Trustee on the Societys Board, owns greater than 35 stock in First Secure Bank Group, Inc., which owns 100 of First Secure Bank and Trust Company. During FY24, The Society entered into a construction and term loan agreement with First Secure Bank and Trust Company. The loan terms and interest rate are comparable or more favorable than market rates. This financing transaction followed the Societys established procurement and financing policies and was approved by the Board of Trustess.
Part IV Line 1	During FY25, the Society paid interest on the loan referenced in Part II line 1.
Part IV Line 2	Mr Pepper, a Trustee on the Societys Board, together with a family member controls greater than 35 of the voting power of Pepper Construction Company. During FY25, the Society made payments to Pepper Construction under construction contracts for two capital projects. The contract terms are at market rates and followed the Societys established procurment policies. The contracts were approved by the Finance Committee of the Board of Trustees.

Schedule M IRS990ScheduleM

Books And Publications BooksAndPublicationsGrp

Field	Value	IRS element (for citing)
Non Cash Checkbox	Yes (X)	NonCashCheckboxInd
Noncash Contributions Rpt F990	$7,782	NoncashContributionsRptF990Amt
Method Of Determining Revenues	cost or selling price	MethodOfDeterminingRevenuesTxt

Securities Publicly Traded SecuritiesPubliclyTradedGrp

Field	Value	IRS element (for citing)
Non Cash Checkbox	Yes (X)	NonCashCheckboxInd
Contribution	28	ContributionCnt
Noncash Contributions Rpt F990	$2,806,371	NoncashContributionsRptF990Amt
Method Of Determining Revenues	price of stock on gift date	MethodOfDeterminingRevenuesTxt

Food Inventory FoodInventoryGrp

Field	Value	IRS element (for citing)
Non Cash Checkbox	Yes (X)	NonCashCheckboxInd
Contribution	2	ContributionCnt
Noncash Contributions Rpt F990	$31,801	NoncashContributionsRptF990Amt
Method Of Determining Revenues	vendor estimated value	MethodOfDeterminingRevenuesTxt

Drugs And Medical Supplies DrugsAndMedicalSuppliesGrp

Field	Value	IRS element (for citing)
Non Cash Checkbox	Yes (X)	NonCashCheckboxInd
Contribution	1	ContributionCnt
Noncash Contributions Rpt F990	$1,200	NoncashContributionsRptF990Amt
Method Of Determining Revenues	cost or selling price	MethodOfDeterminingRevenuesTxt

Scientific Specimens ScientificSpecimensGrp

Field	Value	IRS element (for citing)
Non Cash Checkbox	Yes (X)	NonCashCheckboxInd
Contribution	34	ContributionCnt

Other Non Cash Contri Table OtherNonCashContriTableGrp (4 entries)

Non Cash CheckboxNonCashCheckboxInd	DescDesc	ContributionContributionCnt	Noncash Contributions Rpt F990NoncashContributionsRptF990Amt	Method Of Determining RevenuesMethodOfDeterminingRevenuesTxt
Yes (X)	Operating supplies	19	$46,355	cost or selling price
Yes (X)	Charity Auction Items	28	$43,889	cost or selling price
Yes (X)	Charity Raffle Items	7	$6,776	cost or selling price
Yes (X)	Charity Fundraiser Supplies	1	$600	cost or selling price

Field	Value	IRS element (for citing)
Any Property That Must Be Held	false	AnyPropertyThatMustBeHeldInd
Review Process Unusual NC Gifts	Yes (true)	ReviewProcessUnusualNCGiftsInd
Third Parties Used	Yes (true)	ThirdPartiesUsedInd

Supplemental Information Detail SupplementalInformationDetail (3 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
Part I Line 32b	The Society has an agreement with IDonate to process certain non cash donations on behalf of the Society. Donors donate their items to IDonate Foundation/Servant Foundation, a 501c3 organization, who sells the items, retains a commission and issues a cash grant to the Society for the remainder.
Part I Line 33	Securities Current year contributions of stock which represent payments on pledges recorded as contribution in a previous year are not included in the revenue shown on Form 990, Part VIII, Line 1g. Stock gifts which represent payments of Conditional Contributions for which the conditions for revenue recogntion have not yet been met are also not included in the revenue shown on Form 990, Part VIII, Line 1g.
Part I Line 33	Collection Items/Scientific Specimens A zero dollar amount was reported on Form 990, Part VIII, Line 1g because the Society does not capitalize its collection, as allowed under SFAS 116.

Schedule O IRS990ScheduleO

Supplemental Information Detail SupplementalInformationDetail (9 entries)

Form And Line ReferenceFormAndLineReferenceDesc	ExplanationExplanationTxt
Form 990, Part VI, Section A, Line 1A	The fiscal, general oversight, and policies of the Society are vested in a Board of not more than 58 Trustees. As of March 31, 2025, there were 44 voting Trustess. The elected Officers of the Board, the chairs of the standing committees and such other Trustees as may be appointed by the Chairman constitute the Executive Committee. The Executive Committee has the power to transact all regular business of the Society during the period between the regular Board meetings.
Form 990, Part VI, Section A, Line 3	All restaurant, retail and catering operations are outsourced to a third party service provider.
Form 990, Part VI, Section A, Line 6	The membership of the Society is composed of up to 250 Governing Members. Up to 55 of the 58 Board of Trustees are elected by the Governing Members at their annual meeting. Governing Members are also eligible for appointment by the Societys Chairman to serve on Board committees other than the Exectuive Committee. Governing Members are chosen by the Nominating Committee of the Board of Trustees and voted on by the full Board of Trustees.
Form 990, Part VI, Section A, Line 7A	The membership of the Society is composed of up to 250 Governing Members. Up to 55 of the 58 Board of Trustees are elected by the Governing Members at their annual meeting. Governing Members are also eligible for appointment by the Societys Chairman to serve on the Board committees other than the Executive Committee. Governing Members are chosen by the Nominating and Govenance Committee of the Board of Trustees and voted on by the full Board of Trustees.
Form 990, Part VI, Section B, Line 11B	The IRS Form 990 is prepared by Societys management and reviewed and signed by the Societys tax advisor. The Form 990 is also reviewed by the Audit Committee of the Board of Trustees and a copy of the entire final version of the form is also made available to the Board of Trustees prior to filing with the IRS.
Form 990, Part VI, Section B, Line 12C	Annually, a conflict of interest form is sent out to all members of the Board of Trustess, Key Employees and any employee with purchasing authority. The form covers potential conflicts through financial interests, use of Society services, priviledged information and representation of Society interests. It also covers specific disclosures required by the IRS Form 990 and the Illinois AG990IL. Board of Trustees responses are reviewed by the Secretary of the Board and the Chief Financial and Admin. Officer who together determine if a conflict exists. Employee responses are reviewed by the Sr. VP Human Resources and the Chief Financial and Admin. Officer. Any conflicts are addressed to ensure that all internal procedures are followed for any transactions with that individual and that all items requiring disclosure are properly noted. Any Board members with a conflict must abstain from voting on decisions involving the transaction in question. Any transactions entered into with interested parties follow the Societys established procurement policies and are provided at rates competitive with market rates.
Form 990, Part VI, Section B, Line 15A and 15B	The Societys policy for approval of compensation arrangements with officers and certain senior employees requires review and approval of the compensation arrangement by the Executive Committee of the Board, excluding anyone who is related to or under the control of the person involved in the arrangement. The Committee relies on appropriate comparability data which indicates the types and levels of similar compensation and benefit packages for similar positions provided by similar organizations. The Committee documents the basis for its determination of the reasonableness of compensation. This process is done annually for the President, Chief Financial and Admin Officer, Sr VP of Guest Experience and the Sr. VP Development in any year where there is an increase in compensation.
Form 990, Part VI, Section C, Line 19	Governing documents are available through applicable governmental agencies the conflict of interest policy and financial statements are available upon written request to the Society.
Form 990, Part XI, Line 9	Other Changes in net assets or fund balances Changes in Post Retirement Benefits not yet recognized in operations -213,812 change in market value of swap agreements -141,172 change in pledge reserve -602,000 rounding and other 1714.