- Wisconsin's Endangered
- Animal Welfare Institute
- Endangered Species International
- NOAA Fisheries
- Red List
- Alan's Factory Outlet
- Arkive
- A-Z Animals Endangered
- Defenders of Wildlife
- Earth's Endangered
- Edge of Existence
- Encyclopedia of Life
- Endangered Species Coalition
- Faunalytics
- National Geographic Endangered
- National Wildlife Federation
- Threatened and Endangered Species
- US Fish and Wildlife Service
- World Book Online
- World Wildlife
