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      <Form990PartVIISectionAGrp>
        <PersonNm>JILL KAMENETZ</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SANDRA LEVI GERSTRUNG</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JENNIFER LOWRY</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>GABRIELLE MELKA</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN PICCIOTTO</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CATHERINE PUGH</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SCOTT RIFKIN</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>C DOUG SAWYER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JASON ST JOHN</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>THOMAS STOSUR</PersonNm>
        <TitleTxt>EX-OFFICIO, TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>CHARLES VIETH SR</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JAMES K WILHELM</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>JOHN J BUCKLEY JR</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MARTA D HARTING</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>PHILIP NESTICO</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>SHAWN Z TARRANT</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>WILLIAM H THRUSH JR</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>WILLIAM VONDRASEK</PersonNm>
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        <IndividualTrusteeOrDirectorInd>X</IndividualTrusteeOrDirectorInd>
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      <Form990PartVIISectionAGrp>
        <PersonNm>BETH BLAUER</PersonNm>
        <TitleTxt>TRUSTEE</TitleTxt>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ERNEST BURKEEN JR</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>MARTIN LAMPNER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>THEODORE K OSWALD</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>ROBIN SABATINI</PersonNm>
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        <PersonNm>KENNETH L THOMPSON</PersonNm>
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        <PersonNm>DONALD HUTCHINSON</PersonNm>
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        <PersonNm>KARL KRANZ</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>NANCY NOPPENBERGER</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>NANCY HINDS</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>EVA DEVINE</PersonNm>
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      <Form990PartVIISectionAGrp>
        <PersonNm>DIANE HUTCHINS</PersonNm>
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      <ContractorCompensationGrp>
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          <BusinessName>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>3780 ROOP ROAD</AddressLine1Txt>
            <CityNm>NEW WINDSOR</CityNm>
            <StateAbbreviationCd>MD</StateAbbreviationCd>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>AZOLA &amp; ASSOCIATES INC</BusinessNameLine1Txt>
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        <ContractorAddress>
          <USAddress>
            <AddressLine1Txt>4901 SPRINGARDEN DRIVE</AddressLine1Txt>
            <CityNm>BALTIMORE</CityNm>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
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          <USAddress>
            <AddressLine1Txt>616 WATER STREET SUITE 225</AddressLine1Txt>
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      <ContractorCompensationGrp>
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          <BusinessName>
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            <AddressLine1Txt>721 PEACH CREEK CUTOFF ROAD</AddressLine1Txt>
            <CityNm>COLLEGE STATION</CityNm>
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      <ContractorCompensationGrp>
        <ContractorName>
          <BusinessName>
            <BusinessNameLine1Txt>CLR DESIGN INC</BusinessNameLine1Txt>
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          <USAddress>
            <AddressLine1Txt>833 CHESTNUT ST SUITE 1000</AddressLine1Txt>
            <CityNm>PHILADELPHIA</CityNm>
            <StateAbbreviationCd>PA</StateAbbreviationCd>
            <ZIPCd>19107</ZIPCd>
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      <FundraisingAmt>90900</FundraisingAmt>
      <GovernmentGrantsAmt>9246831</GovernmentGrantsAmt>
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        <Desc>GATE RECEIPTS</Desc>
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      <RentalIncomeOrLossGrp>
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        <ExclusionAmt>332544</ExclusionAmt>
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        <RelatedOrExemptFuncIncomeAmt>5351062</RelatedOrExemptFuncIncomeAmt>
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      <CompCurrentOfcrDirectorsGrp>
        <TotalAmt>631164</TotalAmt>
        <ProgramServicesAmt>134301</ProgramServicesAmt>
        <ManagementAndGeneralAmt>360376</ManagementAndGeneralAmt>
        <FundraisingAmt>136487</FundraisingAmt>
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        <ProgramServicesAmt>5527995</ProgramServicesAmt>
        <ManagementAndGeneralAmt>852948</ManagementAndGeneralAmt>
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        <ContributorBusinessName>
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        </ContributorBusinessName>
        <ContributorUSAddress>
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          <AddressLine2>RESTRICTED</AddressLine2>
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      <PaidStaffOrManagementInd>1</PaidStaffOrManagementInd>
      <MediaAdvertisementsInd>0</MediaAdvertisementsInd>
      <MailingsMembersInd>0</MailingsMembersInd>
      <PublicationsOrBroadcastInd>0</PublicationsOrBroadcastInd>
      <GrantsOtherOrganizationsInd>0</GrantsOtherOrganizationsInd>
      <DirectContactLegislatorsInd>1</DirectContactLegislatorsInd>
      <DirectContactLegislatorsAmt>121337</DirectContactLegislatorsAmt>
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      <NotDescribedSection501c3Ind>0</NotDescribedSection501c3Ind>
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        <ExplanationTxt>THE ORGANIZATION ADVOCATES FOR BUDGETARY INCLUSIONS AT THE EXECUTIVE BRANCH ON BOTH THE STATE AND LOCAL GOVERNMENT LEVELS. AT THE LEGISLATIVE ON BOTH LEVELS, THE ORGANIZATION MONITORS BUDGET ACTIONS AS WELL AS ANY LEGISLATION INTRODUCED THAT COULD IMPACT THE ZOO. ON THE FEDERAL LEVEL, WE MONITOR LEGISLATIVE ACTIVITIES AND RESPOND TO REQUESTS FOR INFORMATION OR PARTICIPATION IN LOBBYING EFFORTS FROM THE ASSOCIATION OF ZOOS AND AQUARIUMS (AZA).</ExplanationTxt>
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      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
      <CompBsdNetEarnsFlngOrgInd>0</CompBsdNetEarnsFlngOrgInd>
      <CompBsdNetEarnsRltdOrgsInd>0</CompBsdNetEarnsRltdOrgsInd>
      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>DONALD HUTCHINSON</PersonNm>
        <TitleTxt>PRESIDENT/CEO</TitleTxt>
        <BaseCompensationFilingOrgAmt>199016</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>4672</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>8133</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>914</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>212735</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
      </RltdOrgOfficerTrstKeyEmplGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION PAYS THE CEO'S MEMBERSHIP TO A SOCIAL CLUB FOR BUSINESS PURPOSES.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>15</ContributionCnt>
        <NoncashContributionsRptF990Amt>152407</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
      </SecuritiesPubliclyTradedGrp>
      <AnyPropertyThatMustBeHeldInd>0</AnyPropertyThatMustBeHeldInd>
      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>0</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, COLUMN (B):</FormAndLineReferenceDesc>
        <ExplanationTxt>THE NUMBER OF CONTRIBUTIONS REPRESENTS THE NUMBER OF CONTRIBUTORS.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 1</FormAndLineReferenceDesc>
        <ExplanationTxt>THE EXECUTIVE COMMITTEE INCLUDES THE CHAIR, VICE CHAIR, SECRETARY, TREASURER, THE CHAIRS OF EACH OF THE STANDING COMMITTEES AND AT LEAST ONE EX-OFFICIO TRUSTEE REPRESENTING EACH OF THE STATE OF MARYLAND AND THE CITY OF BALTIMORE. THE EXECUTIVE COMMITTEE SHALL EXERCISE POWERS OF THE BOARD OF TRUSTEES IN THE INTERVALS BETWEEN THE MEETINGS OF THE BOARD ON MATTERS THAT NECESSITATE INTERIM ACTION. THE ACTIONS OF THE EXECUTIVE COMMITTEE SHALL NOT DEVIATE FROM THE AGREED-ON OR HISTORIC POLICIES OF THE BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION RECEIVED OPERATING GRANTS FROM SEVERAL GOVERNMENTAL ENTITIES, INCLUDING THE STATE OF MARYLAND AND CITY OF BALTIMORE, BOTH OF WHOM HAVE ASSIGNED INDIVIDUALS TO THE BOARD OF TRUSTEES, PURSUANT TO THE BY-LAWS OF THE ORGANIZATION. THESE TRUSTEES HAVE THE SAME VOTING RIGHTS AS ALL OTHER TRUSTEES AND DO NOT HAVE ANY AUTHORITY BEYOND THEIR VOTING RIGHTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM IS FIRST REVIEWED BY THE CONTROLLER, CFO AND CEO OF THE ORGANIZATION. A COPY OF THE RETURN IS THEN REVIEWED AND APPROVED BY THE AUDIT COMMITTEE. ONCE APPROVED BY THE AUDIT COMMITTEE, THE FORM IS ELECTRONCIALLY DISTRIBUTED TO THE FULL BOARD PRIOR TO FILING.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY, TRUSTEES SUBMIT A SURVEY ("CONFLICT OF INTEREST ACKNOWLEDGEMENT"), ON WHICH THEY DESCRIBE ANY POTENTIAL CONFLICTS OF INTEREST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF TRUSTEES APPROVES THE CEO'S COMPENSATION BASED ON COMPARABILITY DATA. OTHER EXECUTIVES AND KEY EMPLOYEES' SALARIES ARE DECIDED BY THE CEO AND CFO BASED ON COMPARABILITY DATA AND REVIEW WITH THE VP OF HUMAN RESOURCES. THE DECISIONS AND APPROVALS OF THE CEO AND CFO ARE FORMALLY DOCUMENTED AND MAINTAINED IN THE EMPLOYEES' PERSONNEL FILE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICIES, AND FINANCIAL STATEMENTS ARE AVAILABLE UPON REQUEST.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleO>
    <IRS990ScheduleR documentId="RetDoc1043400001">
      <IdDisregardedEntitiesGrp>
        <DisregardedEntityName>
          <BusinessNameLine1Txt>MZIB HOSPITAL LLC</BusinessNameLine1Txt>
        </DisregardedEntityName>
        <USAddress>
          <AddressLine1Txt>BALTIMORE ZOO DRUID HILL PARK</AddressLine1Txt>
          <CityNm>BALTIMORE</CityNm>
          <StateAbbreviationCd>MD</StateAbbreviationCd>
          <ZIPCd>21217</ZIPCd>
        </USAddress>
        <EIN>520996352</EIN>
        <PrimaryActivitiesTxt>OWNS AND MANAGES ANIMAL HOSPITAL ON ZOO CAMPUS</PrimaryActivitiesTxt>
        <LegalDomicileStateCd>MD</LegalDomicileStateCd>
        <EndOfYearAssetsAmt>1567885</EndOfYearAssetsAmt>
        <DirectControllingNACd>N/A</DirectControllingNACd>
      </IdDisregardedEntitiesGrp>
    </IRS990ScheduleR>
  </ReturnData>
</Return>