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        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Stephen P Bent</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <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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      </Form990PartVIISectionAGrp>
      <Form990PartVIISectionAGrp>
        <PersonNm>Barbara J Bradford</PersonNm>
        <TitleTxt>Trustee</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>
        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Kevin M Carmody</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
        <AverageHoursPerWeekRt>002.00</AverageHoursPerWeekRt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Dr Bonny Chen</PersonNm>
        <TitleTxt>Trustee as of 5/2017</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Dawn M Davis</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Lawrence E DeMar</PersonNm>
        <TitleTxt>Trustee through 5/2017</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Michael F DeSantiago</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Gregory J DiDomenico</PersonNm>
        <TitleTxt>Trustee as of 5/2017</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Arthur J Fogel</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Sasha Gerritson</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Mrs James M Guyette</PersonNm>
        <TitleTxt>Trustee through 5/2017</TitleTxt>
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        <PersonNm>Philip Lee Harris</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Christine E Holden</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>William L Hood Jr</PersonNm>
        <TitleTxt>Trustee through 3/2017</TitleTxt>
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        <PersonNm>Mrs Peter H Huizenga</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jill V Javors</PersonNm>
        <TitleTxt>Trustee through 4/2017</TitleTxt>
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        <PersonNm>Lisa N Johnson</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Molly Keller</PersonNm>
        <TitleTxt>Trustee as of 5/2017</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Barbara Levy Kipper</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Kevin W Kirby</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Angelo C Kleronomos</PersonNm>
        <TitleTxt>Trustee through 3/2017</TitleTxt>
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        <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</TitleTxt>
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        <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>John W Taylor III</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>William E Thonn</PersonNm>
        <TitleTxt>Trustee</TitleTxt>
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        <PersonNm>Christopher D Traut</PersonNm>
        <TitleTxt>Trustee through 5/2017</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jeffrey D Warner</PersonNm>
        <TitleTxt>Trustee as of 10/2017</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Patrick E Whiteside</PersonNm>
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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>Christopher Jabin</PersonNm>
        <TitleTxt>Sr. VP Development</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Sarah Breen-Bartecki</PersonNm>
        <TitleTxt>Interim Sr VP Conserv. Educ. Community</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Frank W Zeigler</PersonNm>
        <TitleTxt>Sr. VP Animal Programs</TitleTxt>
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        <PersonNm>Michael Owens</PersonNm>
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        <PersonNm>Sandra L Dornhecker</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>Jerome E Johnston</PersonNm>
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        <PersonNm>Leah Rippe</PersonNm>
        <TitleTxt>VP Marketing Communications</TitleTxt>
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        <PersonNm>Jennifer L Baader</PersonNm>
        <TitleTxt>VP Government Affairs</TitleTxt>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Two by Four</BusinessNameLine1Txt>
          </BusinessName>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>10 N Dearborn St Suite 1000</AddressLine1Txt>
            <CityNm>Chicago</CityNm>
            <StateAbbreviationCd>IL</StateAbbreviationCd>
            <ZIPCd>60602</ZIPCd>
          </USAddress>
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        <ServicesDesc>Advertising</ServicesDesc>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>Paymentech LLC</BusinessNameLine1Txt>
          </BusinessName>
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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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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>III 1A</FormAndLineReferenceDesc>
        <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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        <FormAndLineReferenceDesc>III 4</FormAndLineReferenceDesc>
        <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>V 4</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>VI 1A-E</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</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. Accounting principles generally accepted in the United States of America require management to evaluate tax positions taken by the Society and recognize a tax liability if the Society has taken an uncertain position that more likely than not would not be sustained upon examination by the IRS or other applicable taxing authorities. Management has analyzed the tax positions taken by the Society, and has concluded that as of December 31, 2017 and 2016, there are no uncertain positions taken or expected to be taken that would require recognition of a liability or disclosure in the financial statements.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>XI 4b</FormAndLineReferenceDesc>
        <ExplanationTxt>Other Adjustments - Cost of Sales of Inventory -3,953,093, fundraising event expense -658,563, raffle expense -100, Rounding and Misc adjustments 1</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>VII 2d</FormAndLineReferenceDesc>
        <ExplanationTxt>Other Adjustments - Cost of Sales of Inventory 3,953,093, change in market value of swap agreements 22,253, fundraising event expense 658,563, raffle expense 100, Rounding and Misc adjustments -262</ExplanationTxt>
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        <TypeOfActivitiesConductedTxt>program services</TypeOfActivitiesConductedTxt>
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        <CharitableContriEvent2Amt>417607</CharitableContriEvent2Amt>
        <GrossRevenueEvent2Amt>25910</GrossRevenueEvent2Amt>
        <NonCashPrizesEvent2Amt>1297</NonCashPrizesEvent2Amt>
        <RentFacilityCostsEvent2Amt>7994</RentFacilityCostsEvent2Amt>
        <FoodAndBeverageEvent2Amt>40898</FoodAndBeverageEvent2Amt>
        <EntertainmentEvent2Amt>500</EntertainmentEvent2Amt>
        <OtherDirectExpensesEvent2Amt>20810</OtherDirectExpensesEvent2Amt>
        <OtherEventsTotalCnt>3</OtherEventsTotalCnt>
        <GrossReceiptsOtherEventsAmt>216101</GrossReceiptsOtherEventsAmt>
        <CharitableContriOtherEventsAmt>76925</CharitableContriOtherEventsAmt>
        <GrossRevenueOtherEventsAmt>139176</GrossRevenueOtherEventsAmt>
        <RentFcltyCostsOtherEventsAmt>2019</RentFcltyCostsOtherEventsAmt>
        <FoodAndBeverageOtherEventsAmt>23744</FoodAndBeverageOtherEventsAmt>
        <OthDirectExpnssOtherEventsAmt>84727</OthDirectExpnssOtherEventsAmt>
        <GrossReceiptsTotalAmt>1941656</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>1611230</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>330426</GrossRevenueTotalEventsAmt>
        <NonCashPrizesTotalEventsAmt>8475</NonCashPrizesTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>229201</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>148635</FoodAndBeverageTotalEventsAmt>
        <EntertainmentTotalEventsAmt>10500</EntertainmentTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>304783</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>701594</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-371168</NetIncomeSummaryAmt>
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      <GamingInformationGrp>
        <GrossRevenueOtherGamingAmt>51801</GrossRevenueOtherGamingAmt>
        <NonCashPrizesOtherGamingAmt>15052</NonCashPrizesOtherGamingAmt>
        <OthDirectExpnssOtherGamingAmt>100</OthDirectExpnssOtherGamingAmt>
        <VolunteerLaborOtherGamingInd>true</VolunteerLaborOtherGamingInd>
        <VolunteerLaborOtherGamingPct>0.35000</VolunteerLaborOtherGamingPct>
        <GrossRevenueTotalGamingAmt>51801</GrossRevenueTotalGamingAmt>
        <NonCashPrizesTotalGamingAmt>15052</NonCashPrizesTotalGamingAmt>
        <OthDirectExpnssTotalGamingAmt>100</OthDirectExpnssTotalGamingAmt>
        <DirectExpenseSummaryGamingAmt>15152</DirectExpenseSummaryGamingAmt>
        <NetGamingIncomeSummaryAmt>36649</NetGamingIncomeSummaryAmt>
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      <LicenseSuspendedEtcInd>false</LicenseSuspendedEtcInd>
      <GamingWithNonmembersInd>true</GamingWithNonmembersInd>
      <MemberOfOtherEntityInd>false</MemberOfOtherEntityInd>
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      <IndividualWithBooksNm>H Bilcer Mgr FinOper 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>
      <GamingManagerCompensationAmt>984</GamingManagerCompensationAmt>
      <GamingManagerServicesProvTxt>As Chief Advancement Officer, Ms. Zeigler spent a small amt of her time supervising raffles</GamingManagerServicesProvTxt>
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      <CharitableDistributionRqrInd>false</CharitableDistributionRqrInd>
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      <GrantRecordsMaintainedInd>true</GrantRecordsMaintainedInd>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>American Humane Association</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>1400 16th St NW Suite 360</AddressLine1Txt>
          <CityNm>Washington DC</CityNm>
          <StateAbbreviationCd>DC</StateAbbreviationCd>
          <ZIPCd>20036</ZIPCd>
        </USAddress>
        <RecipientEIN>840432950</RecipientEIN>
        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>20000</CashGrantAmt>
        <PurposeOfGrantTxt>general operating support</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Amphibian Ark</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>12101 Johnny Cake Ridge Rd</AddressLine1Txt>
          <CityNm>Apple Valley</CityNm>
          <StateAbbreviationCd>MN</StateAbbreviationCd>
          <ZIPCd>55124</ZIPCd>
        </USAddress>
        <RecipientEIN>461453272</RecipientEIN>
        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>6000</CashGrantAmt>
        <PurposeOfGrantTxt>general operating support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Association of Zoos and Aquariums</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>8403 Colesvill Rd Suite 710</AddressLine1Txt>
          <CityNm>Silver Springs</CityNm>
          <StateAbbreviationCd>MD</StateAbbreviationCd>
          <ZIPCd>20910</ZIPCd>
        </USAddress>
        <RecipientEIN>550526930</RecipientEIN>
        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>25000</CashGrantAmt>
        <PurposeOfGrantTxt>conservation research</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Conservation Breeding Specialist Group-Global Conservation Network</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>12101 Johnny CakeRidge Rd</AddressLine1Txt>
          <CityNm>Apple Valley</CityNm>
          <StateAbbreviationCd>MN</StateAbbreviationCd>
          <ZIPCd>55124</ZIPCd>
        </USAddress>
        <RecipientEIN>411719362</RecipientEIN>
        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>15000</CashGrantAmt>
        <PurposeOfGrantTxt>general operating support</PurposeOfGrantTxt>
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      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>Global Wildlife Conservation</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO Box 129</AddressLine1Txt>
          <CityNm>Austin</CityNm>
          <StateAbbreviationCd>TX</StateAbbreviationCd>
          <ZIPCd>78767</ZIPCd>
        </USAddress>
        <RecipientEIN>262887967</RecipientEIN>
        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>35000</CashGrantAmt>
        <PurposeOfGrantTxt>general operating support</PurposeOfGrantTxt>
      </RecipientTable>
      <RecipientTable>
        <RecipientBusinessName>
          <BusinessNameLine1Txt>International Elephant Foundation</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>PO Box 366</AddressLine1Txt>
          <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>Vital Ground Foundation</BusinessNameLine1Txt>
        </RecipientBusinessName>
        <USAddress>
          <AddressLine1Txt>Bldg 2-T Fort Missoula Rd</AddressLine1Txt>
          <CityNm>Missoula</CityNm>
          <StateAbbreviationCd>MT</StateAbbreviationCd>
          <ZIPCd>59804</ZIPCd>
        </USAddress>
        <RecipientEIN>870483446</RecipientEIN>
        <IRCSectionDesc>501c3</IRCSectionDesc>
        <CashGrantAmt>20000</CashGrantAmt>
        <PurposeOfGrantTxt>general operating support</PurposeOfGrantTxt>
      </RecipientTable>
      <Total501c3OrgCnt>7</Total501c3OrgCnt>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Educ. Scholarship for Conservation Education</GrantTypeTxt>
        <RecipientCnt>5</RecipientCnt>
        <CashGrantAmt>12500</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Conservation Leadership Award</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>5000</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>Conservation Hero Award</GrantTypeTxt>
        <RecipientCnt>1</RecipientCnt>
        <CashGrantAmt>1500</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I Line 2</FormAndLineReferenceDesc>
        <ExplanationTxt>CZS awards grants and assistance through a variety of programs. For awards under the CBT ESF program, 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 and bus stipends 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>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
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      <HousingAllowanceOrResidenceInd>X</HousingAllowanceOrResidenceInd>
      <WrittenPolicyRefTAndEExpnssInd>true</WrittenPolicyRefTAndEExpnssInd>
      <SubstantiationRequiredInd>true</SubstantiationRequiredInd>
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <IndependentConsultantInd>X</IndependentConsultantInd>
      <Form990OfOtherOrganizationsInd>X</Form990OfOtherOrganizationsInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>true</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>true</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>false</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>false</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>false</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>false</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>false</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>true</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>false</InitialContractExceptionInd>
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        <PersonNm>Stuart D Strahl PhD</PersonNm>
        <TitleTxt>President and CEO</TitleTxt>
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        <NontaxableBenefitsFilingOrgAmt>24755</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>642938</TotalCompensationFilingOrgAmt>
        <CompReportPrior990FilingOrgAmt>59862</CompReportPrior990FilingOrgAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Richard G Gamble</PersonNm>
        <TitleTxt>Chief Operating Officer/Exec. VP</TitleTxt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Cynthia W Zeigler</PersonNm>
        <TitleTxt>Chief Advancement Officer</TitleTxt>
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        <TotalCompensationFilingOrgAmt>319276</TotalCompensationFilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Christopher Jabin</PersonNm>
        <TitleTxt>Sr. VP Development</TitleTxt>
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        <OtherCompensationFilingOrgAmt>62634</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>6134</DeferredCompensationFlngOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Sarah Breen-Bartecki</PersonNm>
        <TitleTxt>Interim Sr VP Conserv. Educ. Community</TitleTxt>
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        <OtherCompensationFilingOrgAmt>1270</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>5400</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>7572</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>220626</TotalCompensationFilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Frank W Zeigler</PersonNm>
        <TitleTxt>Sr. VP Animal Programs</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>5684</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>9338</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>216526</TotalCompensationFilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Michael Owens</PersonNm>
        <TitleTxt>VP Information Technology</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>5862</DeferredCompensationFlngOrgAmt>
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        <PersonNm>Sandra L Dornhecker</PersonNm>
        <TitleTxt>VP Human Resources</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>2765</DeferredCompensationFlngOrgAmt>
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        <PersonNm>Jerome E Johnston</PersonNm>
        <TitleTxt>VP Guest Services Operations</TitleTxt>
        <BaseCompensationFilingOrgAmt>161254</BaseCompensationFilingOrgAmt>
        <OtherCompensationFilingOrgAmt>4801</OtherCompensationFilingOrgAmt>
        <DeferredCompensationFlngOrgAmt>4312</DeferredCompensationFlngOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>7369</NontaxableBenefitsFilingOrgAmt>
        <TotalCompensationFilingOrgAmt>177736</TotalCompensationFilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>Leah Rippe</PersonNm>
        <TitleTxt>VP Marketing Communications</TitleTxt>
        <BaseCompensationFilingOrgAmt>156505</BaseCompensationFilingOrgAmt>
        <OtherCompensationFilingOrgAmt>1637</OtherCompensationFilingOrgAmt>
        <NontaxableBenefitsFilingOrgAmt>19249</NontaxableBenefitsFilingOrgAmt>
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        <FormAndLineReferenceDesc>Part I Line 1a</FormAndLineReferenceDesc>
        <ExplanationTxt>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.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part I Line 4a</FormAndLineReferenceDesc>
        <ExplanationTxt>As provided for in the Severance Agreement with the Sr. VP Development related to the elimination of the position, he received a severance payment of 40,329.</ExplanationTxt>
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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 45,902. Also, as provided for in the CZS Deferred Compensation Plan, a payout was made to the President of previously deferred compensation in the amount of 59,862.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part II 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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        <PurposeDesc>Construction and renovation of certain buildings and exhibits</PurposeDesc>
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        <BondReferenceCd>A</BondReferenceCd>
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        <IssuanceCostsFromProceedsAmt>296598</IssuanceCostsFromProceedsAmt>
        <CapitalExpendituresAmt>30539559</CapitalExpendituresAmt>
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        <AdvanceRefundingInd>false</AdvanceRefundingInd>
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        <AnyLeaseArrangementsInd>false</AnyLeaseArrangementsInd>
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        <AnyResearchAgreementsInd>false</AnyResearchAgreementsInd>
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        <VariableRateIssueInd>true</VariableRateIssueInd>
        <HedgeIdentifiedInBksAndRecInd>true</HedgeIdentifiedInBksAndRecInd>
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          <BusinessNameLine1Txt>The Northern Trust co</BusinessNameLine1Txt>
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      <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>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Part IV Line 1</FormAndLineReferenceDesc>
        <ExplanationTxt>During 2017, 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 2017, 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>
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        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <NoncashContributionsRptF990Amt>2300</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
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      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>40</ContributionCnt>
        <NoncashContributionsRptF990Amt>763135</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>price of stock on gift date</MethodOfDeterminingRevenuesTxt>
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      <FoodInventoryGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>7</ContributionCnt>
        <NoncashContributionsRptF990Amt>18076</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
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      <ScientificSpecimensGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>53</ContributionCnt>
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      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Operating Supplies/Equipment</Desc>
        <ContributionCnt>68</ContributionCnt>
        <NoncashContributionsRptF990Amt>1108442</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Charity fundraising supplies</Desc>
        <ContributionCnt>9</ContributionCnt>
        <NoncashContributionsRptF990Amt>19794</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
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      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Charity auction items</Desc>
        <ContributionCnt>44</ContributionCnt>
        <NoncashContributionsRptF990Amt>43031</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>cost or selling price</MethodOfDeterminingRevenuesTxt>
      </OtherNonCashContriTableGrp>
      <OtherNonCashContriTableGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <Desc>Charity raffle items</Desc>
        <ContributionCnt>10</ContributionCnt>
        <NoncashContributionsRptF990Amt>15052</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>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d</FormAndLineReferenceDesc>
        <ExplanationTxt>Program Service Expenses 7,476,000, Grants and allocations 236,509, Revenue 767,384 Center for Conservation Leadership CCL Through its many conservation and 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, curators, graphic and exhibit designers, photographers and many others contribute to sharing this information with visitors. As well as reaching the 2.2 million visitors, CZS engages would be conservationists outside of the Zoo including classrooms of school children, teachers and community leaders. Additionally through field programs, CZS supports efforts to protect and restore populations of threatened species in other parts of the world. The CCL strengthens the bridge between education and conservation, between field research and the animals in our care.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d</FormAndLineReferenceDesc>
        <ExplanationTxt>Program Service Expenses 3,530,000, Grants and allocations 0, Revenue 6,206,912 Admissions and Parking In the course of a year, over 2.2 million visitors enjoy the experience of seeing and learning about the animals of the world. Each individual that enters Brookfield Zoos gates represents an opportunity a chance 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 Brookfield Zoo is open every day of the year. Admission is free to the general public 52 days each year and at all times to Illinois school groups and to military personnel. On certain days throughout the summer extended hours are offered to be more accessible to a more diverse audience.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d</FormAndLineReferenceDesc>
        <ExplanationTxt>Program Service Expenses 1,537,000, Grants and allocations 0, Revenue 4,888,812 Membership The membership program services our over 115,000 member households, providing them with the opportunity to participate in the conservation and educational efforts of CZS. Member services fulfills new and renewing memberships, answers member questions at locations throughout the park and via telephone and provides educational member Animail updates via email. Members receive unlimited free admission, free or discounted parking and in-park attraction admissions and discounts on food and educational classes.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d</FormAndLineReferenceDesc>
        <ExplanationTxt>Program Service Expenses 4,287,000, Grants and allocations 0, Revenue 1,065,428 Marketing and Public Relations CZSs marketing and public relations draws thousands of visitors throughout the year to discover, celebrate and help conserve natures gifts. Through production of seasonal themed events such as Summer Nights, Holiday Magic and Boo at the Zoo, CZS attracts attendance and exposes a wider audience to our mission. Through celebratory events including Freeze Day, Party for the Planet, World Giraffe Day, Animal Enrichment Day and Animal Awareness Weekends, CZS inspires conservation leadership. Through outreach programming to local communities and organizations, CZS reaches out to those who may not have an opportunity to visit the zoo otherwise. Additionally, CZS produces two complementary websites CZS.org is devoted to in-depth discussion of conservation issues designed to inspire conservation leadership in our guests brookfieldzoo.org acquaints future and past visitors with the many exhibits within the Zoo, upcoming special events and visit planning tools.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part III, Line 4d</FormAndLineReferenceDesc>
        <ExplanationTxt>Program Service Expenses 8,888,000, Grants and allocations 0, Revenue 0 Depreciation Depreciation on the Zoos 275 million in buildings and equipment, including animal exhibits, animal care facilities, education spaces, shops and restaurants.</ExplanationTxt>
      </SupplementalInformationDetail>
      <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, 2017, 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.</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 -280,000 change in market value of swap agreements -22,253 rounding and other 261.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>Form 990, Part VI, Section A, Line 4</FormAndLineReferenceDesc>
        <ExplanationTxt>At the September 19, 2017 Board of Trustees meeting the Societys by-laws, last updated in 2009, were revised. Several Standing Committees were reorganized and renamed to be more in line with the current strategic priorities of the Board. Changes included removing the standing committees of Conservation, Research and Education, Governmental Affairs and Guest Experience/Marketing and establishing the new standing committees of Ceneters of Excellence, Community Engagement Social Innovation, Master Site Planning and Strategic Business Model. There were no significant changes to the standing committees of Finance and Investment, Audit and Controls, Nominating and Governance and Development. Additional changes were made to the Governing Members section to add consistency.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
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