Organizations
- American Anti-Vivisection Society
- American Society for the Prevention of Cruelty to Animals
- Animal Legal Defense Fund
- Animals & Society Institute
- Association of Lawyers for Animal Welfare, UK
- Best Friends Animal Society
- Born Free USA united with Animal Protection Institute
- Captive Wild Animal Protection Coalition
- Center for Biological Diversity
- Center for International Environmental Law
- Center for Wildlife Law
- Chicago Project on Animal Treatment Principles
- Compassion Over Killing
- Defenders of Wildlife
- Doris Day Animal League
- Earth Justice
- Farm Sanctuary
- Humane Legislative Fund
- The Humane Society of the United States
- In Defense of Animals
- In Defense of Animals-Africa
- Institute for Animal Rights Law
- International Fund for Animal Welfare
- International Society for Animal Rights
- Massachusetts Society for the Prevention of Cruelty to Animals
- National Anti-Vivisection Society
- National Institute for Animal Advocacy
- People for the Ethical Treatment of Animals
- Physicians Committee for responsible Medicine
- Society for Animal Protective Legislation
- Southern Regional Animal Legal Protection Fund
- Species Survival Network
- United Animal Nations
- Viva! USA
- Voiceless, Australia
- World Wildlife Fund