Because this list is getting so long, I am moving it from the homepage to its own thread. Add any links you'd like in the comment field below. When I have time, I will add them to this list (and then delete your comment). Thanks. 

Last Update: 2011.04.02
 

All About Birds
Alley Cat Allies
American Bird Conservancy
American Wild Horse Preservation Campaign
Animal Cognition Network
Animal Concerns Research and Education Society
Animal Farm Foundation (Pit Bulls)
Animal Legal Defense Fund
Animals Matter to Me
Animal Sanctuaries and Wildlife Reserves
Animal Welfare Institute
Audubon
Badger Trust
Bat Conservation International
Big Wildlife
Biodiverstiy Research Institute
BirdLife International
The Bonobo Initiative
Center for Biological Diversity
Center for Great Apes
Center for Marine Biodiversity & Conservation
Chimpanzee Collaboratory
Chimp Haven
Chimpanzee Sanctuary Northwest
The Cloud Foundation: Preserving Wild Horses
Coastal Observation and Seabird Survey Team
Con Slobodchikoff (Behavior and science)
Conservation International
Crows.net
The David Sheldrick Wildlife Trust
The Dian Fossey Gorilla Fund
Defenders of Wildlife
Dog Behavior Blog
Dolphin Research Center
Ducks Unlimited
Earth TV
Earthwatch Institute
Earthworks
The Elephant Sanctuary
Endangered Species Coalition
Eurogroup for Animals
Farm Sanctuary
Friends of Bonobos
Great Apes Survival Partnership
Great Ape Trust
Help Elephants
Hornbill Research Foundation
Humane Farming Association
Humane Myth.org
In Defense of Animals
Integrated Sloth Bear Conservation and Welfare Project
International Bird Rescue Research Center
International Crane Foundation
International Fund for Animal Welfare
The International Union for Conservation of Nature
The Jane Goodall Institute
Korea Animal Rights Advocates
Lenfest Ocean Program
Marine Conservation Society
Max Planck Institute for Ornithology
Mercy for Animals
Mindy's Memory Primate Sanctuary
Monarch Watch
Mongabay.com
National Wildlife Federation
Natural Resources Defense Council
North American Bear Center
Ocean Conservancy
Oceana
Ocean Futures Society
Orangutan Foundation International
Performing Animal Welfare Society
Pet-Abuse.com
The Prairie Dog Coalition
Project Coyote
Rainforest Action Network
Rainforest Alliance
Save Japan Dolphins
Save the Chimps
Save the Elephants
Save the Frogs
Save the Manatee Club
Save the Orangutan
Save Pangolins
Save Tigers Now
Shark Savers
Sumatran Orangutan Society
United Animal Nations
U.S. Fish and Wildlife Service
U. S. Geological Survey
Whale and Dolphin Conservation Society
Wildlife Advocacy Project
Wildlife Conservation Society
The Wildlife Land Trust
Wildlife SOS | India
Wildlife Trust
The Wildlife Trusts
Woods Hole Oceanographic Institute