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      <RelatedOrgListSchRInd>1</RelatedOrgListSchRInd>
      <BuildingsGrp>
        <OtherCostOrOtherBasisAmt>1143524</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>823730</DepreciationAmt>
        <BookValueAmt>319794</BookValueAmt>
      </BuildingsGrp>
      <LeaseholdImprovementsGrp>
        <OtherCostOrOtherBasisAmt>2473425</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>1543440</DepreciationAmt>
        <BookValueAmt>929985</BookValueAmt>
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      <EquipmentGrp>
        <OtherCostOrOtherBasisAmt>249787</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>220853</DepreciationAmt>
        <BookValueAmt>28934</BookValueAmt>
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      <OtherLandBuildingsGrp>
        <OtherCostOrOtherBasisAmt>130874</OtherCostOrOtherBasisAmt>
        <DepreciationAmt>73169</DepreciationAmt>
        <BookValueAmt>57705</BookValueAmt>
      </OtherLandBuildingsGrp>
      <TotalBookValueLandBuildingsAmt>1336418</TotalBookValueLandBuildingsAmt>
      <OtherSecuritiesGrp>
        <Desc>HEDGE FUNDS</Desc>
        <BookValueAmt>400077</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <OtherSecuritiesGrp>
        <Desc>PRIVATE EQUITY</Desc>
        <BookValueAmt>940305</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <OtherSecuritiesGrp>
        <Desc>PRIVATE CREDIT</Desc>
        <BookValueAmt>300098</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
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      <OtherSecuritiesGrp>
        <Desc>MUTUAL FUND</Desc>
        <BookValueAmt>360447</BookValueAmt>
        <MethodValuationCd>F</MethodValuationCd>
      </OtherSecuritiesGrp>
      <TotalBookValueSecuritiesAmt>2000927</TotalBookValueSecuritiesAmt>
      <OtherLiabilitiesOrgGrp>
        <Desc>ACCRUED LIABILITES</Desc>
        <Amt>30501</Amt>
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      <OtherLiabilitiesOrgGrp>
        <Desc>LEASE LIABILITY</Desc>
        <Amt>2581</Amt>
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      <TotalLiabilityAmt>33082</TotalLiabilityAmt>
      <FootnoteTextInd>X</FootnoteTextInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART III, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MUSEUM IS ORGANIZED TO MAINTAIN PUBLIC EXHIBITS, TO PROMOTE AND CONDUCT SCIENTIFIC AND EDUCATIONAL EXPEDITIONS, AND TO PROMOTE AN INTEREST IN THE STUDY OF SCIENCE. THE COLLECTIONS IN THE EXHIBIT HALLS FURTHER THE ORGANIZATION'S PURPOSE.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART V, LINE 4:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MUSEUM'S ENDOWMENT CONSISTS OF APPROXIMATELY TWENTY-ONE INDIVIDUAL FUNDS ESTABLISHED FOR A VARIETY OF PURPOSES. THE ENDOWMENT INCLUDES BOTH DONOR RESTRICTED FUNDS AND FUNDS DESIGNATED BY THE BOARD OF TRUSTEES (QUASI-ENDOWMENT) TO FUNCTION AS ENDOWMENT.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART X, LINE 2:</FormAndLineReferenceDesc>
        <ExplanationTxt>THE MUSEUM HAS EVALUATED ITS TAX POSITIONS AND THE CERTAINTY AS TO WHETHER THOSE POSITIONS WILL BE SUSTAINED IN THE EVENT OF AN AUDIT BY TAXING AUTHORITIES AT THE FEDERAL AND STATE LEVELS. THE PRIMARY TAX POSITIONS EVALUATED ARE RELATED TO THE MUSEUMS CONTINUED QUALIFICATION AS A TAX- EXEMPT ORGANIZATION AND WHETHER THERE ARE UNRELATED BUSINESS INCOME ACTIVITIES CONDUCTED THAT WOULD BE TAXABLE. MANAGEMENT HAS DETERMINED THAT ALL INCOME TAX POSITIONS ARE MORE LIKELY THAN NOT OF BEING SUSTAINED UPON POTENTIAL AUDIT OR EXAMINATION; THEREFORE, NO DISCLOSURES OF UNCERTAIN INCOME TAX POSITIONS ARE REQUIRED.</ExplanationTxt>
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        <Event1Nm>PECCARY DINNER</Event1Nm>
        <GrossReceiptsEvent1Amt>143420</GrossReceiptsEvent1Amt>
        <CharitableContriEvent1Amt>110040</CharitableContriEvent1Amt>
        <GrossRevenueEvent1Amt>33380</GrossRevenueEvent1Amt>
        <RentFacilityCostsEvent1Amt>10204</RentFacilityCostsEvent1Amt>
        <FoodAndBeverageEvent1Amt>39833</FoodAndBeverageEvent1Amt>
        <EntertainmentEvent1Amt>5690</EntertainmentEvent1Amt>
        <OtherDirectExpensesEvent1Amt>12264</OtherDirectExpensesEvent1Amt>
        <GrossReceiptsTotalAmt>143420</GrossReceiptsTotalAmt>
        <CharitableContributionsTotAmt>110040</CharitableContributionsTotAmt>
        <GrossRevenueTotalEventsAmt>33380</GrossRevenueTotalEventsAmt>
        <RentFcltyCostsTotalEventsAmt>10204</RentFcltyCostsTotalEventsAmt>
        <FoodAndBeverageTotalEventsAmt>39833</FoodAndBeverageTotalEventsAmt>
        <EntertainmentTotalEventsAmt>5690</EntertainmentTotalEventsAmt>
        <OthDirectExpnssTotalEventsAmt>12264</OthDirectExpnssTotalEventsAmt>
        <DirectExpenseSummaryEventsAmt>67991</DirectExpenseSummaryEventsAmt>
        <NetIncomeSummaryAmt>-34611</NetIncomeSummaryAmt>
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      <SubstantiationRequiredInd>1</SubstantiationRequiredInd>
      <CompensationCommitteeInd>X</CompensationCommitteeInd>
      <IndependentConsultantInd>X</IndependentConsultantInd>
      <WrittenEmploymentContractInd>X</WrittenEmploymentContractInd>
      <CompensationSurveyInd>X</CompensationSurveyInd>
      <BoardOrCommitteeApprovalInd>X</BoardOrCommitteeApprovalInd>
      <SeverancePaymentInd>0</SeverancePaymentInd>
      <SupplementalNonqualRtrPlanInd>0</SupplementalNonqualRtrPlanInd>
      <EquityBasedCompArrngmInd>0</EquityBasedCompArrngmInd>
      <CompBasedOnRevenueOfFlngOrgInd>0</CompBasedOnRevenueOfFlngOrgInd>
      <CompBsdOnRevRelatedOrgsInd>0</CompBsdOnRevRelatedOrgsInd>
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      <AnyNonFixedPaymentsInd>0</AnyNonFixedPaymentsInd>
      <InitialContractExceptionInd>0</InitialContractExceptionInd>
      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>THERESA SMITH PHD</PersonNm>
        <TitleTxt>EX-OFFICIO TRUSTEE</TitleTxt>
        <BaseCompensationFilingOrgAmt>0</BaseCompensationFilingOrgAmt>
        <CompensationBasedOnRltdOrgsAmt>349958</CompensationBasedOnRltdOrgsAmt>
        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
        <BonusRelatedOrganizationsAmt>0</BonusRelatedOrganizationsAmt>
        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
        <OtherCompensationRltdOrgsAmt>0</OtherCompensationRltdOrgsAmt>
        <DeferredCompensationFlngOrgAmt>0</DeferredCompensationFlngOrgAmt>
        <DeferredCompRltdOrgsAmt>34000</DeferredCompRltdOrgsAmt>
        <NontaxableBenefitsFilingOrgAmt>0</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>1416</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>0</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>385374</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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      <RltdOrgOfficerTrstKeyEmplGrp>
        <PersonNm>JANET K PEDDY CFO</PersonNm>
        <TitleTxt>CFO</TitleTxt>
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        <CompensationBasedOnRltdOrgsAmt>294235</CompensationBasedOnRltdOrgsAmt>
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        <OtherCompensationFilingOrgAmt>0</OtherCompensationFilingOrgAmt>
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        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <PersonNm>ANDREW FARKE PHD</PersonNm>
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        <BonusFilingOrganizationAmount>0</BonusFilingOrganizationAmount>
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        <NontaxableBenefitsFilingOrgAmt>24621</NontaxableBenefitsFilingOrgAmt>
        <NontaxableBenefitsRltdOrgsAmt>0</NontaxableBenefitsRltdOrgsAmt>
        <TotalCompensationFilingOrgAmt>159143</TotalCompensationFilingOrgAmt>
        <TotalCompensationRltdOrgsAmt>0</TotalCompensationRltdOrgsAmt>
        <CompReportPrior990FilingOrgAmt>0</CompReportPrior990FilingOrgAmt>
        <CompReportPrior990RltdOrgsAmt>0</CompReportPrior990RltdOrgsAmt>
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        <FormAndLineReferenceDesc>PART I, LINE 3</FormAndLineReferenceDesc>
        <ExplanationTxt>STAFF COMPILE DATA FOR ALL OFFICER (HEAD, CFO, ETC) AND KEY EMPLOYEE POSITIONS FROM A VARIETY OF SOURCES, INCLUDING SALARY DATA FROM NAIS, CAIS, CAL-ISBOA AND ADP. MARKET INFORMATION IS COMPILED REGULARLY. THE ADMINISTRATION AND CONSULTANTS CONDUCT MARKET RESEARCH BASED ON INDUSTRY STANDARDS IN SIMILAR ORGANIZATIONS WHEN DETERMINING COMPENSATION FOR OFFICERS AND KEY EMPLOYEES. THE BOARD OF TRUSTEES REVIEWS AND APPROVES TOTAL COMPENSATION PACKAGES FOR OTHER KEY EMPLOYEES. THE HEAD OF SCHOOLS APPROVES COMPENSATION FOR ALL OTHER EMPLOYEES.</ExplanationTxt>
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    </IRS990ScheduleJ>
    <IRS990ScheduleM documentId="RetDoc1042900001">
      <SecuritiesPubliclyTradedGrp>
        <NonCashCheckboxInd>X</NonCashCheckboxInd>
        <ContributionCnt>5</ContributionCnt>
        <NoncashContributionsRptF990Amt>19897</NoncashContributionsRptF990Amt>
        <MethodOfDeterminingRevenuesTxt>FMV</MethodOfDeterminingRevenuesTxt>
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      <ReviewProcessUnusualNCGiftsInd>1</ReviewProcessUnusualNCGiftsInd>
      <ThirdPartiesUsedInd>1</ThirdPartiesUsedInd>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>PART I, LINE 32B:</FormAndLineReferenceDesc>
        <ExplanationTxt>REAL ESTATE BROKERS AND AUCTION HOUSES ARE SOMETIMES USED DEPENDING ON THE NATURE OF THE GIFT.</ExplanationTxt>
      </SupplementalInformationDetail>
    </IRS990ScheduleM>
    <IRS990ScheduleO documentId="RetDoc1044400001">
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 1A</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE SHALL BE AN EXECUTIVE COMMITTEE OF THE BOARD OF TRUSTEES CONSISTING OF THE CHAIR OF THE BOARD, THE PRESIDENT, AND SUCH ADDITIONAL MEMBERS OF THE BOARD OF TRUSTEES AS MAY BE APPOINTED BY THE BOARD. EXCEPT AS HEREINAFTER PROVIDED, AND SUBJECT TO SUCH LIMITATIONS AS MAY BE REQUIRED BY STATUTE, WHEN THE BOARD OF TRUSTEES IS NOT IN SESSION AND THE CHAIR OF THE BOARD OR THE CORPORATE MEMBER DETERMINES THAT IMMEDIATE ACTION IS NECESSARY, THE EXECUTIVE COMMITTEE, UPON UNANIMOUS VOTE OF A QUORUM OF THE MEMBERS OF THE EXECUTIVE COMMITTEE MAY EXERCISE ALL OF THE POWERS OF THE BOARD OF TRUSTEES. HOWEVER, THE EXECUTIVE COMMITTEE SHALL NOT, UNDER ANY CIRCUMSTANCES, HAVE THE POWER TO ADOPT, AMEND, OR REPEAL BYLAWS; TO DISPOSE OF THE REAL PROPERTY OF THE MUSEUM, OR ANY OF ITS ORIGINAL FOSSIL COLLECTIONS; TO REMOVE OR TO ACCEPT THE RESIGNATION OF THE PRESIDENT; OR TO APPOINT OR ELECT MEMBERS OF THE BOARD OF TRUSTEES.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 6</FormAndLineReferenceDesc>
        <ExplanationTxt>THE WEBB SCHOOLS IS THE SOLE MEMBER OF THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7A</FormAndLineReferenceDesc>
        <ExplanationTxt>THE WEBB SCHOOLS APPOINT THE TRUSTEES OF THE ORGANIZATION.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 7B</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE ARE NO DECISIONS RESERVED FOR THE WEBB SCHOOLS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION A, LINE 8B</FormAndLineReferenceDesc>
        <ExplanationTxt>COMMITTEES DO NOT RECORD MINUTES FOR INDIVIDUAL MEETINGS. INSTEAD, THEY PRESENT THEIR REPORTS AT THE FULL BOARD MEETING, WHERE MINUTES ARE OFFICIALLY DOCUMENTED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 11B</FormAndLineReferenceDesc>
        <ExplanationTxt>THE 990 RETURN IS REVIEWED BY THE CHIEF FINANCIAL OFFICER AND THEN DISTRIBUTED TO THE GOVERNING BODY BEFORE IT IS FILED.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 12C</FormAndLineReferenceDesc>
        <ExplanationTxt>ALL MEMBERS OF THE GOVERNING BODY, OFFICERS AND KEY EMPLOYEES FILL OUT A CONFLICT OF INTEREST DISCLOSURE FORM ON AN ANNUAL BASIS. FORMS ARE REVIEWED BY THE CHIEF FINANCIAL OFFICER AND ANY CONCERNS ARE BROUGHT TO THE ATTENTION OF THE CHAIRMAN OF THE BOARD.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION B, LINE 15</FormAndLineReferenceDesc>
        <ExplanationTxt>THE BOARD OF TRUSTEES APPROVES A BUDGET ANNUALLY, WHICH INCLUDES THE TOTAL AMOUNT TO BE SPENT ON EMPLOYEE COMPENSATION. WITHIN THOSE PARAMETERS, THE DIRECTOR OF THE MUSEUM MAKES A RECOMMENDATION TO THE HEAD OF THE WEBB SCHOOLS, WHO REVIEWS AND SETS INDIVIDUAL SALARIES. THE DIRECTOR OF THE MUSEUM RECEIVES AN EMPLOYMENT CONTRACT. SALARY EQUITY IS REVIEWED PERIODICALLY TO ENSURE THAT COMPENSATION IS EQUITABLE WITH RESPECT TO GENDER, EXPERIENCE, EDUCATION, AND ASSIGNED DUTIES. THE PROCESS IS DONE BY COMPARING SALARIES AMONG LIKE POSITIONS WITHIN THE INSTITUTION AND TO SIMILAR POSITIONS IN OTHER INSTITUTIONS. BENEFIT PACKAGES ARE REVIEWED ANNUALLY AND MANDATED NONDISCRIMINATION TESTING IS DONE AS REQUIRED. THE PROCESS DESCRIBED HERE WAS LAST COMPLETED IN 2024. (NO NEED IN 2025 DUE TO NO SIGNIFICANT LEADERSHIP CHANGES).</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART VI, SECTION C, LINE 19</FormAndLineReferenceDesc>
        <ExplanationTxt>GOVERNING DOCUMENTS, CONFLICT OF INTEREST POLICY, AND FINANCIAL STATEMENTS ARE DISTRIBUTED TO THE GOVERNING BODY. THESE ITEMS ARE AVAILABLE UPON REQUEST TO OTHERS.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XI, LINE 9:</FormAndLineReferenceDesc>
        <ExplanationTxt>GIFTS RECEIVED AND APPLIED 236,883.</ExplanationTxt>
      </SupplementalInformationDetail>
      <SupplementalInformationDetail>
        <FormAndLineReferenceDesc>FORM 990, PART XII, LINE 2C:</FormAndLineReferenceDesc>
        <ExplanationTxt>THERE WERE NO CHANGES TO THE AUDIT COMMITTEE'S OVERSIGHT PROCESS OR SELECTION PROCESS DURING THE YEAR.</ExplanationTxt>
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          <StateAbbreviationCd>CA</StateAbbreviationCd>
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</Return>