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Private foundations don’t post open calls, so nobody can search them. We read IRS filings instead — 9.6 million grants from 174,053 foundations and grantmaking charities, searchable by what the money was actually for.

12 funders with a record of paying for “mammals”

Where the money went

1.0×
Ncasi Foundation → National Council for Air and Stream Improvement Inc: $3.2M across 4 grants, latest 2024John Templeton Foundation → Leiden University: $900K across 3 grants, latest 2024National Fish and Wildlife Foundation → Channel Islands Marine and Wildlife Institute: $576K across 1 grant, latest 2022Otter Cove Foundation → The Marine Mammal Center: $300K across 3 grants, latest 2024Devereux Ocean Foundation Inc → Bahamas Marine Mammal Research: $292K across 4 grants, latest 2024The Km Shimano Family Foundation → The Marine Mammal Center: $105K across 3 grants, latest 2025Scott and Jessica Mcclintock Foundation → National Marine Mammal Foundation Inc: $94K across 4 grants, latest 2024Knopf Family Foundation Inc → Busch Wildlife Sanctuary: $75K across 2 grants, latest 2024The Bernard J & Mary T Johnson Family → Marine Mammal Center: $68K across 3 grants, latest 2024Wags and Menace Make A Difference Foundation → Pacific Marine Mammal Center: $41K across 6 grants, latest 2025Anderson-Rogers Foundation Inc → Marine Mammal Care Center Los Angeles: $30K across 2 grants, latest 2025The Harold and Judy Mckonly Family → Raven Ridge Wildlife Refuge: $23K across 4 grants, latest 2025National Fish and Wildlife Foundation → California Ocean Alliance: $525K across 2 grants, latest 2023John Templeton Foundation → Fundacio Sant Joan De Dei: $354K across 1 grant, latest 2022The Km Shimano Family Foundation → Marine Mammals of Maine: $75K across 3 grants, latest 2025Knopf Family Foundation Inc → Pelican Harbor Seabird Station Inc: $55K across 1 grant, latest 2024Scott and Jessica Mcclintock Foundation → Shannon Elizabeth Foundation: $42K across 3 grants, latest 2023Wags and Menace Make A Difference Foundation → Northcoast Marine Mammal Center: $32K across 12 grants, latest 2025Anderson-Rogers Foundation Inc → Marine Mammal Stranding Center: $20K across 2 grants, latest 2025The Harold and Judy Mckonly Family → Dolphin Rescue Center: $12K across 4 grants, latest 2025National Fish and Wildlife Foundation → Sea World of Florida LLC: $443K across 1 grant, latest 2023John Templeton Foundation → Children's Hospital Corporation: $300K across 1 grant, latest 2024Knopf Family Foundation Inc → The Conservancy of Southwest Florida: $45K across 1 grant, latest 2024Scott and Jessica Mcclintock Foundation → Save the Rhino International Inc: $25K across 2 grants, latest 2023Wags and Menace Make A Difference Foundation → Marine Mammal Care Center Los Angeles: $14K across 8 grants, latest 2025The Km Shimano Family Foundation → Marine Mammal Stranding Center: $7K across 1 grant, latest 2025National Fish and Wildlife Foundation → The Wild Neighbors Database Project: $385K across 2 grants, latest 2023National Fish and Wildlife Foundation → Smelts Sea Mammal Education Learning Technology Society: $374K across 1 grant, latest 2023John Templeton Foundation → University of Massachusetts: $282K across 1 grant, latest 2022National Fish and Wildlife Foundation → Dolphins Plus Oceanside Marine Mammal Responder Inc: $274K across 2 grants, latest 2022National Fish and Wildlife Foundation → Gulf World Marine Institute: $153K across 1 grant, latest 2023National Fish and Wildlife Foundation → Audubon Nature Institute: $136K across 1 grant, latest 2022National Fish and Wildlife Foundation → Lifescape International Inc: $115K across 1 grant, latest 2023National Fish and Wildlife Foundation → Dolphins Plus: $107K across 1 grant, latest 2023National Fish and Wildlife Foundation → Marine Mammal Care Center Losa Angeles: $100K across 1 grant, latest 2023National Fish and Wildlife Foundation → Tenaya A Norris: $98K across 1 grant, latest 2021National Fish and Wildlife Foundation → Marine Mammals of Maine: $75K across 2 grants, latest 2023National Fish and Wildlife Foundation → Whale and Dolphin Conservation Society: $68K across 2 grants, latest 2022National Fish and Wildlife Foundation → Clearwater Marine Aquarium: $61K across 1 grant, latest 2023National Fish and Wildlife Foundation → Pacific Marine Mammal Center: $44K across 1 grant, latest 2021National Fish and Wildlife Foundation → Atlantic Marine Conservation: $42K across 1 grant, latest 2022National Fish and Wildlife Foundation → Hawaii Marine Mammal Alliance Inc: $42K across 1 grant, latest 2023National Fish and Wildlife Foundation → Emerald Coast Wildlife Refuge: $42K across 1 grant, latest 2023Knopf Family Foundation Inc → National Audubon Society Inc - Corkscrew Swamp Sanctuary & Blair Audubon: $35K across 1 grant, latest 2022National Fish and Wildlife Foundation → Cascadia Research: $31K across 1 grant, latest 2021National Fish and Wildlife Foundation → Ri Dept of Environmental Management: $26K across 1 grant, latest 2022National Fish and Wildlife Foundation → National Marine Life Center Inc: $22K across 1 grant, latest 2021National Fish and Wildlife Foundation → Smelts Sea Mammal Edu Learning Tech Society: $21K across 1 grant, latest 2021Knopf Family Foundation Inc → Audubon Society of New Hampshire: $20K across 1 grant, latest 2025National Fish and Wildlife Foundation → Burk Family Trust: $15K across 1 grant, latest 2022National Fish and Wildlife Foundation → Atlantic Marine Conservation Society: $6K across 1 grant, latest 2021Wags and Menace Make A Difference Foundation → Marine Mammal Center: $4K across 4 grants, latest 2025National Fish and Wildlife Foundation: $3.8M on this topic. Open the funder.National Fish and Wildlife Fo…$3.8MNcasi Foundation: $3.2M on this topic. Open the funder.Ncasi Foundation$3.2MJohn Templeton Foundation: $1.8M on this topic. Open the funder.John Templeton Foundation$1.8MOtter Cove Foundation: $300K on this topic. Open the funder.Otter Cove Foundation$300KDevereux Ocean Foundation Inc: $292K on this topic. Open the funder.Devereux Ocean Foundation Inc$292KKnopf Family Foundation Inc: $230K on this topic. Open the funder.Knopf Family Foundation Inc$230KThe Km Shimano Family Foundation: $187K on this topic. Open the funder.The Km Shimano Family Foundat…$187KScott and Jessica Mcclintock Foundation: $162K on this topic. Open the funder.Scott and Jessica Mcclintock…$162KWags and Menace Make A Difference Foundation: $91K on this topic. Open the funder.Wags and Menace Make A Differ…$91KThe Bernard J & Mary T Johnson Family: $68K on this topic. Open the funder.The Bernard J & Mary T Johnso…$68KAnderson-Rogers Foundation Inc: $50K on this topic. Open the funder.Anderson-Rogers Foundation Inc$50KThe Harold and Judy Mckonly Family: $35K on this topic. Open the funder.The Harold and Judy Mckonly F…$35KNational Council for Air and Stream Improvement Inc: received $3.2M on this topicNational Council for Air and St…$3.2MLeiden University: received $900K on this topicLeiden University$900KChannel Islands Marine and Wildlife Institute: received $576K on this topicChannel Islands Marine and Wild…$576KCalifornia Ocean Alliance: received $525K on this topicCalifornia Ocean Alliance$525KSea World of Florida LLC: received $443K on this topicSea World of Florida LLC$443KThe Wild Neighbors Database Project: received $385K on this topicThe Wild Neighbors Database Pro…$385KSmelts Sea Mammal Education Learning Technology Society: received $374K on this topicSmelts Sea Mammal Education Lea…$374KFundacio Sant Joan De Dei: received $354K on this topicFundacio Sant Joan De Dei$354KThe Marine Mammal Center: received $300K on this topicThe Marine Mammal Center$300KChildren's Hospital Corporation: received $300K on this topicChildren's Hospital Corporation$300KBahamas Marine Mammal Research: received $292K on this topicBahamas Marine Mammal Research$292KUniversity of Massachusetts: received $282K on this topicUniversity of Massachusetts$282KDolphins Plus Oceanside Marine Mammal Responder Inc: received $274K on this topicDolphins Plus Oceanside Marine…$274KGulf World Marine Institute: received $153K on this topicGulf World Marine Institute$153KMarine Mammals of Maine: received $150K on this topicMarine Mammals of Maine$150KAudubon Nature Institute: received $136K on this topicAudubon Nature Institute$136KLifescape International Inc: received $115K on this topicLifescape International Inc$115KDolphins Plus: received $107K on this topicDolphins Plus$107KThe Marine Mammal Center: received $105K on this topicThe Marine Mammal Center$105KMarine Mammal Care Center Losa Angeles: received $100K on this topicMarine Mammal Care Center Losa…$100KTenaya A Norris: received $98K on this topicTenaya A Norris$98KNational Marine Mammal Foundation Inc: received $94K on this topicNational Marine Mammal Foundati…$94KPacific Marine Mammal Center: received $85K on this topicPacific Marine Mammal Center$85KBusch Wildlife Sanctuary: received $75K on this topicBusch Wildlife Sanctuary$75KMarine Mammal Center: received $72K on this topicMarine Mammal Center$72KWhale and Dolphin Conservation Society: received $68K on this topicWhale and Dolphin Conservation…$68KClearwater Marine Aquarium: received $61K on this topicClearwater Marine Aquarium$61KPelican Harbor Seabird Station Inc: received $55K on this topicPelican Harbor Seabird Station…$55KThe Conservancy of Southwest Florida: received $45K on this topicThe Conservancy of Southwest Fl…$45KMarine Mammal Care Center Los Angeles: received $44K on this topicMarine Mammal Care Center Los A…$44KAtlantic Marine Conservation: received $42K on this topicAtlantic Marine Conservation$42KShannon Elizabeth Foundation: received $42K on this topicShannon Elizabeth Foundation$42KHawaii Marine Mammal Alliance Inc: received $42K on this topicHawaii Marine Mammal Alliance I…$42KEmerald Coast Wildlife Refuge: received $42K on this topicEmerald Coast Wildlife Refuge$42KNational Audubon Society Inc - Corkscrew Swamp Sanctuary & Blair Audubon: received $35K on this topicNational Audubon Society Inc -…$35KNorthcoast Marine Mammal Center: received $32K on this topicNorthcoast Marine Mammal Center$32KCascadia Research: received $31K on this topicCascadia Research$31KMarine Mammal Stranding Center: received $27K on this topicMarine Mammal Stranding Center$27KRi Dept of Environmental Management: received $26K on this topicRi Dept of Environmental Manage…$26KSave the Rhino International Inc: received $25K on this topicSave the Rhino International Inc$25KRaven Ridge Wildlife Refuge: received $23K on this topicRaven Ridge Wildlife Refuge$23KNational Marine Life Center Inc: received $22K on this topicNational Marine Life Center Inc$22KSmelts Sea Mammal Edu Learning Tech Society: received $21K on this topicSmelts Sea Mammal Edu Learning…$21KAudubon Society of New Hampshire: received $20K on this topicAudubon Society of New Hampshire$20KBurk Family Trust: received $15K on this topicBurk Family Trust$15KDolphin Rescue Center: received $12K on this topicDolphin Rescue Center$12KAtlantic Marine Conservation Society: received $6K on this topicAtlantic Marine Conservation So…$6K
12 funders, 47 recipients, grants matching “mammals” only. Ribbon width is proportional to the total given; each funder has its own colour (smaller funders in gray). Hover a name to isolate its flows, click a funder to open it. Drag to move around; zoom with the buttons, a double-click, or the wheel after clicking the map.

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Source: IRS Form 990-PF Part XV and Form 990 Schedule I, tax years 20192025. These are grants already paid, a record of what an organization funds rather than an open call. Private foundations rarely accept unsolicited applications and the route in is usually a program officer; grantmaking charities and associations more often run real application cycles, so check their website. How this data is built, and its limits →