| Land | The Nature Conservancy | Largest private land conservation organization; manages millions of acres globally | nature.org | @nature_org |
| Land | Ducks Unlimited | Private wetlands conservation; 15+ million acres protected | ducks.org | @DucksUnlimited |
| Wildlife Conservation | WWF (World Wildlife Fund) | Global nonprofit operating in 100+ countries protecting wildlife and natural habitats through field programs, science, and policy. | worldwildlife.org | @WWF |
| Wildlife Conservation | Conservation International | US-based nonprofit protecting nature through science, partnerships, and field programs across 30+ countries. | conservation.org | @conservation |
| Wildlife Conservation | American Bird Conservancy | US nonprofit focused on preventing extinction and protecting native bird species through habitat conservation and threat abatement. | abcbirds.org | @ABCbirds |
| Wildlife Conservation | African Wildlife Foundation | Nonprofit working across Africa to protect wildlife and wildlands through community-based conservation and anti-poaching programs. | awf.org | @AWF_Official |