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      <NetGainOrLossInvestmentsGrp>
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      <OtherExpensesGrp>
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      <OtherExpensesGrp>
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      <OtherExpensesGrp>
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        <ManagementAndGeneralAmt>31862</ManagementAndGeneralAmt>
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      <TotalFunctionalExpensesGrp>
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        <ProgramServicesAmt>4215962</ProgramServicesAmt>
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        <EOYAmt>13443594</EOYAmt>
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      <FederalGrantAuditPerformedInd>1</FederalGrantAuditPerformedInd>
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      <InvestmentIncomePYPct>0.03040</InvestmentIncomePYPct>
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        <FormAndLineReferenceDesc>PART II-B, LINE 1:</FormAndLineReferenceDesc>
        <ExplanationTxt>A. VOLUNTEERS: SEVERAL TIMES PER YEAR, ESA SOLICITS UP TO 50 GRADUATE STUDENTS TO VOLUNTEER FOR A DAY OF MEETINGS WITH LAWMAKERS ON CAPITOL HILL. ADDITIONALLY, FOR A MAXIMUM OF ONE TO THREE OCCASIONS PER YEAR, ESA MAY INVITE INDIVIDUAL ESA MEMBERS FOR EITHER MEETINGS WITH THEIR SENATORS AND HOUSE MEMBER OR TO PARTICIPATE IN AN HOUR LONG BRIEFING OR EXHIBITION. B. PAID STAFF OR MANAGEMENT: PAID STAFF AND MANAGEMENT PARTICIPATION IN MEETINGS WITH LAWMAKERS IS LIMITED TO JOINING ESA MEMBERS AND GRADUATE STUDENTS IN THE AFOREMENTIONED MEETINGS WITH LAWMAKERS AND OCCASIONALLY OTHER NONPROFIT SCIENTIFIC ORGANIZATIONS IN MEETINGS WITH LAWMAKERS ON THE HILL OR FEDERAL AGENCY OFFICIALS, ALL OF WHICH GENERALLY TOTAL A DOZEN OR LESS SEPARATE OCCASIONS PER YEAR. D. MAILINGS TO MEMBERS, LEGISLATORS OR THE PUBLIC: ON AN AVERAGE OF 20-30 OCCASIONS PER YEAR, ESA WILL SPEARHEAD A LETTER OR CO-SIGN A LETTER DRAFTED BY ANOTHER ORGANIZATION ADDRESSED TO LEGISLATORS OR A FEDERAL AGENCY OFFICIAL. A MAJORITY OF THESE LETTERS ARE ORGANIZATIONAL AND DRAFTED BY OTHER NONPROFIT ENTITIES. ALERTS ENCOURAGING MEMBERS TO CONTACT THEIR LOCAL LEGISLATOR VIA PHONE OR EMAIL ARE EITHER DISTRIBUTED OR CO-SPONSORED BY ESA GENERALLY TWO TO FOUR TIMES PER YEAR. ESA DOES NOT DISTRIBUTE MAILINGS TO THE GENERAL PUBLIC. G. DIRECT CONTACT WITH LEGISLATORS, THEIR STAFFS, GOVERNMENT OFFICIALS, OR A LEGISLATIVE BODY: DIRECT CONTACT WITH ALL GOVERNMENT OFFICIALS, POLICYMAKERS AND STAFF ARE LIMITED TO THE AFOREMENTIONED ANNUAL BRIEFINGS AND THROUGH THE AFOREMENTIONED MEETINGS WITH CAPITOL HILL AND FEDERAL AGENCY POLICYMAKERS.</ExplanationTxt>
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        <Desc>DEPOSITS</Desc>
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        <Desc>RIGHT-OF-USE ASSET</Desc>
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        <Desc>REFUNDABLE ADVANCE</Desc>
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      <OtherLiabilitiesOrgGrp>
        <Desc>LEASE LIABILITY</Desc>
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      <TotalLiabilityAmt>1268449</TotalLiabilityAmt>
      <TotalRevEtcAuditedFinclStmtAmt>7142882</TotalRevEtcAuditedFinclStmtAmt>
      <NetUnrealizedGainsInvstAmt>177744</NetUnrealizedGainsInvstAmt>
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      <RevenueNotReportedFinclStmtAmt>76016</RevenueNotReportedFinclStmtAmt>
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      <ExpensesSubtotalAmt>6278082</ExpensesSubtotalAmt>
      <InvestmentExpensesNotIncld2Amt>76016</InvestmentExpensesNotIncld2Amt>
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      <TotalExpensesPerForm990Amt>6354098</TotalExpensesPerForm990Amt>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE PURPOSE OF THE ORGANIZATION'S ENDOWMENT FUND IS TO PROTECT THE ORGANIZATION'S OPERATIONS SHOULD THERE BE A SLOWDOWN OR DECREASE IN UNRESTRICTED REVENUE.</ExplanationTxt>
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    <IRS990ScheduleI documentId="RetDoc1041900001">
      <GrantRecordsMaintainedInd>1</GrantRecordsMaintainedInd>
      <GrantsOtherAsstToIndivInUSGrp>
        <GrantTypeTxt>AWARDS</GrantTypeTxt>
        <RecipientCnt>39</RecipientCnt>
        <CashGrantAmt>19039</CashGrantAmt>
      </GrantsOtherAsstToIndivInUSGrp>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>AWARDS ARE CASH PRIZES FOR EXCELLENCE IN ECOLOGY. THE FUNDS ARE NOT MONITORED AFTER AWARDED.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleI>
    <IRS990ScheduleJ documentId="RetDoc1042400001">
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
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      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
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        <PersonNm>CATHERINE O'RIORDAN</PersonNm>
        <TitleTxt>EXECUTIVE DIRECTOR</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>0</CompensationBasedOnRltdOrgsAmt>
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        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
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        <DeferredCompensationFlngOrgAmt>31107</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>1835</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>344011</TotalCompensationFilingOrgAmt>
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        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ALISON MIZE</PersonNm>
        <TitleTxt>DIRECTOR OF PUBLIC AFFAIRS</TitleTxt>
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        <DeferredCompensationFlngOrgAmt>12867</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>0</DeferredCompRltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>THET OO</PersonNm>
        <TitleTxt>DIRECTOR IT</TitleTxt>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>ADRIENNE SPONBERG</PersonNm>
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        <PersonNm>TERESA MOURAD</PersonNm>
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    <IRS990ScheduleL documentId="RetDoc1042800001">
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        <NameOfInterested>
          <BusinessName>
            <BusinessNameLine1Txt>C NELSON HOY &amp; COMPANY</BusinessNameLine1Txt>
          </BusinessName>
        </NameOfInterested>
        <RelationshipDescriptionTxt>THE OWNER OF C. NELSON HOY &amp; COMPANY IS THE CFO OF THE ORGANIZATION.</RelationshipDescriptionTxt>
        <TransactionAmt>239400</TransactionAmt>
        <TransactionDesc>MANAGEMENT SERVICES AS CFO.</TransactionDesc>
        <SharingOfRevenuesInd>0</SharingOfRevenuesInd>
      </BusTrInvolveInterestedPrsnGrp>
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    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION PAYS A COMPANY FOR THE SERVICES OF ITS CFO, ELIZABETH BIGGS. COMPENSATION FOR HER SERVICES FOR THE CALENDAR 2022 YEAR TOTALED $236,400.</ExplanationTxt>
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      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION HAS APPROXIMATELY 8,000 DUES PAYING MEMBERS, CONSISTING OF SIX TYPES OF MEMBERS: REGULAR MEMBER, EMERITUS MEMBER, STUDENT MEMBER, DEVELOPING COUNTRIES MEMBER, LIFE MEMBER AND CONTRIBUTING MEMBER.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MEMBERS OF THE GOVERNING BOARD ARE VOTED INTO OFFICE BY THE MEMBERSHIP.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MEMBERSHIP APPROVES CHANGES TO THE ORGANIZATION'S BYLAWS OR OTHER GOVERNING DOCUMENTS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 8B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMMITTEES DO NOT KEEP MINUTES AT THEIR MEETINGS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE FORM 990 WAS PREPARED BY THE OUTSIDE ACCOUNTANTS AND REVIEWED BY THE EXECUTIVE DIRECTOR AND THE CFO BEFORE FILING. AFTER THEIR REVIEW, A COPY IS POSTED ON A SECURE SITE ALLOWING THE BOARD MEMBERS TO REVIEW THE RETURN, AND SUBSEQUENT TO THAT THE RETURN IS FILED WITH THE INTERNAL REVENUE SERVICE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ANNUALLY, EACH GOVERNING BOARD MEMBER AND SENIOR STAFF SIGNS A CONFLICT OF INTEREST POLICY STATEMENT TO INDICATE THAT THE COI POLICY HAS BEEN REVIEWED AND THE PERSON IS IN COMPLIANCE WITH THE POLICY. CONFLICTS OF INTEREST ARE HANDLED ON A CASE-BY-CASE BASIS BY THE GOVERNING BOARD, WHICH HAS THE RESPONSIBILITY TO DETERMINE APPROPRIATE ACTION WITH REGARD TO THE REAL OR PERCEIVED CONFLICT OF INTEREST.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE COMPENSATION FOR THE EXECUTIVE DIRECTOR IS DETERMINED BY THE GOVERNING BOARD AFTER A DISCUSSION AND DELIBERATION BY THE ENTIRE BOARD. IT INCLUDES THE USE OF COMPARABILITY DATA AND THE DECISION IS DOCUMENTED. THE LAST COMPENSATION REVIEW WAS IN DECEMBER 2022. COMPENSATION FOR ALL SENIOR STAFF IS DETERMINED BY THE EXECUTIVE DIRECTOR AND TAKES INTO ACCOUNT GENERAL TRENDS IN THE MARKET PLACE AS WELL AS EQUITY WITHIN THE STAFF.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>THE ORGANIZATION'S GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY AND FINANCIAL STATEMENTS ARE POSTED ON ITS WEBSITE AND ARE ALSO AVAILABLE UPON REQUEST.</ExplanationTxt>
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</Return>
