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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Walter W Becky II</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <ReportableCompFromRltdOrgAmt>0</ReportableCompFromRltdOrgAmt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Stephen P Bent</PersonNm>
        <TitleTxt>Trustee through 12/18</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Jay D Bergman</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Edward McCormick Blair Jr</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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        <OtherCompensationAmt>0</OtherCompensationAmt>
      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Barbara J Bradford</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>James A Bryan</PersonNm>
        <TitleTxt>Trustee as of 9/18</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>John A Carpenter</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Kevin M Carmody</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Dr Bonny Chen</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Dawn M Davis</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Michael F DeSantiago</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Gregory J DiDomenico</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Arthur J Fogel</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Sasha L Gerritson</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Veronica Gomez</PersonNm>
        <TitleTxt>Trustee as of 9/18</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Joseph A Gregoire</PersonNm>
        <TitleTxt>Trustee as of 9/18</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Philip Lee Harris</PersonNm>
        <TitleTxt>Trustee through 5/18</TitleTxt>
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        <PersonNm>Christine E Holden</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Heidi Huizenga</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Lisa N Johnson</PersonNm>
        <TitleTxt>Trustee through 8/18</TitleTxt>
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        <PersonNm>Kevin M Keeley</PersonNm>
        <TitleTxt>Trustee as of 12/18</TitleTxt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Molly Keller</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Barbara Levy Kipper</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Kevin W Kirby</PersonNm>
        <TitleTxt>Trustee through 9/18</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>William O Lipinski</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Jerry Manne</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Christian B McGrath</PersonNm>
        <TitleTxt>Trustee through 12/18</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Toni Reed Preckwinkle</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Mark G Sander</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ted Staszak</PersonNm>
        <TitleTxt>Trustee as of 9/18</TitleTxt>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>John W Taylor III</PersonNm>
        <TitleTxt>Trustee through 5/18</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>William E Thonn</PersonNm>
        <TitleTxt>Trustee through 12/18</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jeffrey D Warner</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Patrick E Whiteside</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Ryan P Williamson</PersonNm>
        <TitleTxt>Trustee as of 3/18</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Richard G Gamble</PersonNm>
        <TitleTxt>Chief Operating Officer/Exec. VP</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Cynthia W Zeigler</PersonNm>
        <TitleTxt>Chief Advancement Officer</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>David E Burns</PersonNm>
        <TitleTxt>Sr VP Finance</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Sarah Breen-Bartecki</PersonNm>
        <TitleTxt>Sr VP Conserv.,Educ. Training</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Frank W Zeigler</PersonNm>
        <TitleTxt>Sr. VP Animal Programs</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Michael Owens</PersonNm>
        <TitleTxt>VP Information Technology</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Sandra L Dornhecker</PersonNm>
        <TitleTxt>VP Human Resources</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jerome E Johnston</PersonNm>
        <TitleTxt>VP Guest Services Operations</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Leah Rippe</PersonNm>
        <TitleTxt>VP Marketing Communications</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jennifer L Baader</PersonNm>
        <TitleTxt>VP Government Affairs</TitleTxt>
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        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Two by Four</BusinessNameLine1Txt>
          </BusinessName>
        </ContractorName>
        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>10 N Dearborn St Suite 1000</AddressLine1Txt>
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        <ExplanationTxt>The Chicago Zoological Society is a private non profit organization that operates Brookfield Zoo on land owned by the Forest Preserve District of Cook County. Brookfield Zoo was created through an act of the Illinois Legislature and the Society annually receives partial funding from Cook County 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 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>
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        <ExplanationTxt>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.</ExplanationTxt>
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        <ExplanationTxt>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.</ExplanationTxt>
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        <ExplanationTxt>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.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>X 2</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
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        <ExplanationTxt>Other Adjustments - Cost of Sales of Inventory -3,219,350, fundraising event expense -654,770, raffle/gambling expense -6,299, Rounding and Misc adjustments 881</ExplanationTxt>
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      <SupplementalInformationDetail>
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        <ExplanationTxt>The Society awards grants through its Chicago Board of Trade Endangered Species Fund CBT ESF. The grant cycle is 2 times per year. Grant proposals are reviewed by a team of four. 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 50,000 is awarded each cycle, usually in amounts of 2000 to 5000 per grant. Final award recommendations are presented to the Executive Committee of the Board of Trustees by the CBOT 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.</ExplanationTxt>
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        <ExplanationTxt>The Society also holds funds raised for avian conservation and 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 Avian Scientific Advisory Group and the Pangolin Consortium Group. These groups are composed of staff from the Society and other like-minded institutions. Both groups have written grant application, awarding, tracking and reporting processes in place. All grant payments approved by the groups must follow the Societys established internal procedures before payment is made.</ExplanationTxt>
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          <StateAbbreviationCd>IL</StateAbbreviationCd>
          <ZIPCd>60606</ZIPCd>
        </USAddress>
        <ActivityTxt>Consulting-fundraising dinner</ActivityTxt>
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        <GrossReceiptsAmt>1345424</GrossReceiptsAmt>
        <RetainedByContractorAmt>70326</RetainedByContractorAmt>
        <NetToOrganizationAmt>1275098</NetToOrganizationAmt>
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      <TotalGrossReceiptsAmt>1345424</TotalGrossReceiptsAmt>
      <TotalRetainedByContractorsAmt>70326</TotalRetainedByContractorsAmt>
      <TotalNetToOrganizationAmt>1275098</TotalNetToOrganizationAmt>
      <LicensedStatesCd>FL</LicensedStatesCd>
      <LicensedStatesCd>IL</LicensedStatesCd>
      <LicensedStatesCd>IN</LicensedStatesCd>
      <LicensedStatesCd>WI</LicensedStatesCd>
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        <CharitableContriEvent1Amt>1142367</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>203057</GrossRevenueEvent1Amt>
        <NonCashPrizesEvent1Amt>6067</NonCashPrizesEvent1Amt>
        <RentFacilityCostsEvent1Amt>214809</RentFacilityCostsEvent1Amt>
        <FoodAndBeverageEvent1Amt>75803</FoodAndBeverageEvent1Amt>
        <EntertainmentEvent1Amt>10000</EntertainmentEvent1Amt>
        <OtherDirectExpensesEvent1Amt>202634</OtherDirectExpensesEvent1Amt>
        <Event2Nm>Conservation Awards Dinner</Event2Nm>
        <GrossReceiptsEvent2Amt>422997</GrossReceiptsEvent2Amt>
        <CharitableContriEvent2Amt>380637</CharitableContriEvent2Amt>
        <GrossRevenueEvent2Amt>42360</GrossRevenueEvent2Amt>
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        <RentFacilityCostsEvent2Amt>8858</RentFacilityCostsEvent2Amt>
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        <CharitableContriOtherEventsAmt>138277</CharitableContriOtherEventsAmt>
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        <FoodAndBeverageOtherEventsAmt>23301</FoodAndBeverageOtherEventsAmt>
        <OthDirectExpnssOtherEventsAmt>110254</OthDirectExpnssOtherEventsAmt>
        <GrossReceiptsTotalAmt>2059224</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>1661281</CharitableContributionsTotAmt>
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        <RentFcltyCostsTotalEventsAmt>225810</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>147136</FoodAndBeverageTotalEventsAmt>
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        <OthDirectExpnssTotalEventsAmt>328798</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>718115</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-320172</NetIncomeSummaryAmt>
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      <GamingInformationGrp>
        <GrossRevenueOtherGamingAmt>60210</GrossRevenueOtherGamingAmt>
        <NonCashPrizesOtherGamingAmt>15700</NonCashPrizesOtherGamingAmt>
        <OthDirectExpnssOtherGamingAmt>5174</OthDirectExpnssOtherGamingAmt>
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        <GrossRevenueTotalGamingAmt>60210</GrossRevenueTotalGamingAmt>
        <NonCashPrizesTotalGamingAmt>15700</NonCashPrizesTotalGamingAmt>
        <OthDirectExpnssTotalGamingAmt>5174</OthDirectExpnssTotalGamingAmt>
        <DirectExpenseSummaryGamingAmt>20874</DirectExpenseSummaryGamingAmt>
        <NetGamingIncomeSummaryAmt>39336</NetGamingIncomeSummaryAmt>
      </GamingInformationGrp>
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      <GamingWithNonmembersInd>true</GamingWithNonmembersInd>
      <MemberOfOtherEntityInd>false</MemberOfOtherEntityInd>
      <GamingOwnFacilityPct>1.00000</GamingOwnFacilityPct>
      <IndividualWithBooksNm>H Bilcer Dir Financial Analysis</IndividualWithBooksNm>
      <PersonsWithBooksUSAddress>
        <AddressLine1Txt>3300 Golf Rd</AddressLine1Txt>
        <CityNm>Brookfield</CityNm>
        <StateAbbreviationCd>IL</StateAbbreviationCd>
        <ZIPCd>60513</ZIPCd>
      </PersonsWithBooksUSAddress>
      <CntrctWith3rdPrtyForGameRevInd>false</CntrctWith3rdPrtyForGameRevInd>
      <GamingManagerPersonNm>C Zeigler</GamingManagerPersonNm>
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      <GamingManagerServicesProvTxt>As Chief Advancement Officer, Ms. Zeigler spent a small amt of her time supervising raffles</GamingManagerServicesProvTxt>
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        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1400 16th St NW Suite 360</AddressLine1Txt>
          <CityNm>Washington DC</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
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        <RecipientEIN>840432950</RecipientEIN>
        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>25000</CashGrantAmt>
        <PurposeOfGrantTxt>public education</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
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          <AddressLine1Txt>12101 Johnny Cake Ridge Rd</AddressLine1Txt>
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          <StateAbbreviationCd>MN</StateAbbreviationCd>
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          <AddressLine1Txt>12101 Johnny Cake Ridge Rd</AddressLine1Txt>
          <CityNm>Apple Valley</CityNm>
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        <PurposeOfGrantTxt>general operating support</PurposeOfGrantTxt>
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        <USAddress>
          <AddressLine1Txt>411 S Wells St Suite 300</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
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        <IRCSectionDesc>501c3</IRCSectionDesc>
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        <PurposeOfGrantTxt>general operating support</PurposeOfGrantTxt>
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          <BusinessNameLine1Txt>Global Wildlife Conservation</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO Box 129</AddressLine1Txt>
          <CityNm>Austin</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
          <ZIPCd>78767</ZIPCd>
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        <RecipientEIN>262887967</RecipientEIN>
        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>35000</CashGrantAmt>
        <PurposeOfGrantTxt>general operating support</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>International Elephant Foundation</BusinessNameLine1Txt>
        </RecipientBusinessName>
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          <CityNm>Azle</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
          <ZIPCd>76098</ZIPCd>
        </USAddress>
        <RecipientEIN>752815706</RecipientEIN>
        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>10000</CashGrantAmt>
        <PurposeOfGrantTxt>general operating support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Pilsen Neighbors Community Council</BusinessNameLine1Txt>
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          <AddressLine1Txt>2026 Blue Island Ave</AddressLine1Txt>
          <CityNm>Chicago</CityNm>
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        <IRCSectionDesc>501c3</IRCSectionDesc>
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        <PurposeOfGrantTxt>outreach event sponsorship</PurposeOfGrantTxt>
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          <BusinessNameLine1Txt>South Texas Zoological Society</BusinessNameLine1Txt>
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          <CityNm>Victoria</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
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          <BusinessNameLine1Txt>Species 360</BusinessNameLine1Txt>
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          <AddressLine1Txt>7900 International Drive Suite 1040</AddressLine1Txt>
          <CityNm>Minneapolis</CityNm>
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        </USAddress>
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        <IRCSectionDesc>501c3</IRCSectionDesc>
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        <PurposeOfGrantTxt>animal care enhancement program</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Synchronicity Earth USA</BusinessNameLine1Txt>
        </RecipientBusinessName>
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          <CityNm>New York</CityNm>
          <StateAbbreviationCd>NY</StateAbbreviationCd>
          <ZIPCd>10024</ZIPCd>
        </USAddress>
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        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>25000</CashGrantAmt>
        <PurposeOfGrantTxt>amphibian conservation</PurposeOfGrantTxt>
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          <BusinessNameLine1Txt>Vital Ground Foundation</BusinessNameLine1Txt>
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          <AddressLine1Txt>Bodg 2T Fort Missoula Road</AddressLine1Txt>
          <CityNm>Missoula</CityNm>
          <StateAbbreviationCd>MT</StateAbbreviationCd>
          <ZIPCd>59804</ZIPCd>
        </USAddress>
        <RecipientEIN>870483446</RecipientEIN>
        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>40000</CashGrantAmt>
        <PurposeOfGrantTxt>general operating support</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>11</Total501c3OrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Educ. Scholarship for Conservation Education</GrantTypeTxt>
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        <CashGrantAmt>25000</CashGrantAmt>
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      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Conservation Leadership Award</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>5000</CashGrantAmt>
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        <FormAndLineReferenceDesc>Part I Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>CZS awards grants and assistance through a variety of programs. For awards under the CBT ESF and Avian 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>
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      <SubstantiationRequiredInd>true</SubstantiationRequiredInd>
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      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
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      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
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      <SupplementalNonqualRtrPlanInd>true</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
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      <InitialContractExceptionInd>false</InitialContractExceptionInd>
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        <PersonNm>Stuart D Strahl PhD</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Richard G Gamble</PersonNm>
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        <PersonNm>Cynthia W Zeigler</PersonNm>
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        <PersonNm>David E Burns</PersonNm>
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        <PersonNm>Sarah Breen-Bartecki</PersonNm>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Frank W Zeigler</PersonNm>
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        <PersonNm>Sandra L Dornhecker</PersonNm>
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        <PersonNm>Leah Rippe</PersonNm>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I Line 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>As provided for in the CZS Deferred Compensation Plan and as approved by the Board of Trustees, a deferred contribution plus interest credit was made to the Plan on behalf of the President in the amount of 50,085.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I Line 7</FormAndLineReferenceDesc>
        <ExplanationTxt>As indicated in Schedule J part II, certain individuals received bonuses based on performance and the financial results of the organization. These bonuses are approved by the Board of Trustees.</ExplanationTxt>
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        <PoolFinancingInd>false</PoolFinancingInd>
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      <TaxExemptBondsProceedsGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <RetiredAmt>9130000</RetiredAmt>
        <TotalProceedsAmt>39850000</TotalProceedsAmt>
        <CapitalizedInterestAmt>595445</CapitalizedInterestAmt>
        <IssuanceCostsFromProceedsAmt>296598</IssuanceCostsFromProceedsAmt>
        <CapitalExpendituresAmt>30539559</CapitalExpendituresAmt>
        <SubstantialCompletionYr>2010</SubstantialCompletionYr>
        <RefundingTaxExemptBondsInd>false</RefundingTaxExemptBondsInd>
        <RefundingTaxableBondsInd>false</RefundingTaxableBondsInd>
        <FinalAllocationMadeInd>true</FinalAllocationMadeInd>
        <AdequateBooksAndRecMaintInd>true</AdequateBooksAndRecMaintInd>
      </TaxExemptBondsProceedsGrp>
      <TaxExemptBondsPrivateBusUseGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <OwningBondFinancedPropertyInd>false</OwningBondFinancedPropertyInd>
        <AnyLeaseArrangementsInd>false</AnyLeaseArrangementsInd>
        <MgmtContractBondFincdPropInd>false</MgmtContractBondFincdPropInd>
        <AnyResearchAgreementsInd>false</AnyResearchAgreementsInd>
        <PrivateBusConcerningUBIPct>0.01230</PrivateBusConcerningUBIPct>
        <TotalPrivateBusinessUsePct>0.01230</TotalPrivateBusinessUsePct>
        <BondIssMeetPrvtSecPymtTestInd>false</BondIssMeetPrvtSecPymtTestInd>
        <ChangeInUseBondFinancedPropInd>false</ChangeInUseBondFinancedPropInd>
        <ProcsNonqualifiedBondRemdtdInd>true</ProcsNonqualifiedBondRemdtdInd>
      </TaxExemptBondsPrivateBusUseGrp>
      <TaxExemptBondsArbitrageGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <Form8038TFiledInd>false</Form8038TFiledInd>
        <NoRebateDueInd>true</NoRebateDueInd>
        <VariableRateIssueInd>true</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>true</HedgeIdentifiedInBksAndRecInd>
        <HedgeProviderName>
          <BusinessNameLine1Txt>The Northern Trust Co</BusinessNameLine1Txt>
        </HedgeProviderName>
        <TermOfHedgePct>0000000010.000000000000</TermOfHedgePct>
        <SuperintegratedHedgeInd>false</SuperintegratedHedgeInd>
        <HedgeTerminatedInd>false</HedgeTerminatedInd>
        <GrossProceedsInvestedInGICInd>false</GrossProceedsInvestedInGICInd>
        <GrossProceedsInvestedInd>false</GrossProceedsInvestedInd>
        <WrittenProcToMonitorReqsInd>true</WrittenProcToMonitorReqsInd>
      </TaxExemptBondsArbitrageGrp>
      <ProceduresCorrectiveActionGrp>
        <BondReferenceCd>A</BondReferenceCd>
        <ProceduresCorrectiveActionInd>true</ProceduresCorrectiveActionInd>
      </ProceduresCorrectiveActionGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II Line 11A</FormAndLineReferenceDesc>
        <ExplanationTxt>Some proceeds of the bonds were used to retire a portion of the bonds as reported in Part II, Line 1A</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IV Line 2c</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleK>
    <IRS990ScheduleL documentId="990L" softwareId="18007340" softwareVersionNum="19.1.1.0">
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>Cynthia W Zeigler</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>Family Member of Key Employee</RelationshipDescriptionTxt>
        <TransactionAmt>351858</TransactionAmt>
        <TransactionDesc>employment</TransactionDesc>
        <SharingOfRevenuesInd>false</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <BusTrInvolveInterestedPrsnGrp>
        <NameOfInterested>
          <PersonNm>Frank W Zeigler</PersonNm>
        </NameOfInterested>
        <RelationshipDescriptionTxt>Family Member of Key Employee</RelationshipDescriptionTxt>
        <TransactionAmt>217262</TransactionAmt>
        <TransactionDesc>employment</TransactionDesc>
        <SharingOfRevenuesInd>false</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IV Line 1</FormAndLineReferenceDesc>
        <ExplanationTxt>During 2018, Cynthia W. Zeigler was employed as Chief Advancement Officer. She is a family member of key employee Frank W. Zeigler. Her employment follows the Societys established recruiting, hiring and compensation policies.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IV Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>During 2018, Frank W. Zeigler was employed as Sr. VP Animal Programs. He is a family member of key employee Cynthia W. Zeigler. His employment follows the Societys established recruiting, hiring and compensation policies.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleL>
    <IRS990ScheduleM documentId="990M" softwareId="18007340" softwareVersionNum="19.1.1.0">
      <WorksOfArtGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>1</ContributionCnt>
        <NoncashContributionsRptF990Amt>2000</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
      </WorksOfArtGrp>
      <BooksAndPublicationsGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <NoncashContributionsRptF990Amt>1268</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
      </BooksAndPublicationsGrp>
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>51</ContributionCnt>
        <NoncashContributionsRptF990Amt>770577</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>price of stock on gift date</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <FoodInventoryGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>15</ContributionCnt>
        <NoncashContributionsRptF990Amt>30108</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
      </FoodInventoryGrp>
      <ScientificSpecimensGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>50</ContributionCnt>
      </ScientificSpecimensGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Operating Supplies/Equipment</Desc>
        <ContributionCnt>37</ContributionCnt>
        <NoncashContributionsRptF990Amt>585780</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Charity fundraising supplies</Desc>
        <ContributionCnt>8</ContributionCnt>
        <NoncashContributionsRptF990Amt>6615</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Charity Auction items</Desc>
        <ContributionCnt>48</ContributionCnt>
        <NoncashContributionsRptF990Amt>63346</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Charity Raffle items</Desc>
        <ContributionCnt>7</ContributionCnt>
        <NoncashContributionsRptF990Amt>14575</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <AnyPropertyThatMustBeHeldInd>false</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>true</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>true</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I Line 32b</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I Line 33</FormAndLineReferenceDesc>
        <ExplanationTxt>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</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I Line 33</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="990O" softwareId="18007340" softwareVersionNum="19.1.1.0">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>The fiscal, general oversight, and policies of the Society are vested in a Board of not more than 58 Trustees. As of December 31, 2018, there were 43 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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>Cindy Zeigler, Key Employee and Frank Zeigler, Key Employee - Family Relationship.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 6</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>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. 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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>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 Sr. VP Finance who together determine if a conflict exists. Employee responses are reviewed by the VP Human Resources and the Sr. VP Finance. 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.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section B, Line 15A and 15B</FormAndLineReferenceDesc>
        <ExplanationTxt>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, Sr. VP of Operatons, Sr. VP of Finance and the Chief Advancement Officer any year where there is an increase in compensation.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section C, Line 19</FormAndLineReferenceDesc>
        <ExplanationTxt>Governing documents are available through applicable governmental agencies the conflict of interest policy and financial statements are available upon written request to the Society.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part XI, Line 9</FormAndLineReferenceDesc>
        <ExplanationTxt>Other Changes in net assets or fund balances Changes in Post Retirement Benefits not yet recognized in operations 649,000 change in market value of swap agreements 63,375 rounding and other -496.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
  </ReturnData>
</Return>