Uniting all Americans to ensure wildlife thrive in a rapidly changing world, the National Wildlife Federation builds upon our nation's conservation heritage for present and future generations.

The Nature Conservancy is tackling the root causes of some of the toughest problems facing people and nature today, replicating good ideas to save many places and improve people’s lives.

World Wildlife Fund - The leading organization in wildlife conservation and endangered species. Learn how you can help WWF make a difference.

Defenders of Wildlife works on the ground, in the courts, and on Capitol Hill to protect and restore imperiled wildlife and habitats across North America. Together, we can ensure a future for the wildlife and wild places we all love.

We provide science about the natural hazards that threaten lives and livelihoods; the water, energy, minerals, and other natural resources we rely on; the health of our ecosystems and environment; and the impacts of climate and land-use change. Our scientists develop new methods and tools to supply timely, relevant, and useful information about the Earth and its processes.

Established in 1964, the IUCN Red List of Threatened Species has evolved to become the world’s most comprehensive information source on the global conservation status of animal, fungi and plant species.

the xerces society is a science-based nonprofit organization that protects wildlife through the conservation of invertebrates and their habitats.

iNaturalist is a social network for naturalists! Record your observations of plants and animals, share them with friends and researchers, and learn about the natural world.

The Center for Biological Diversity works through science, law and creative media to secure a future for all species, great or small, hovering on the brink of extinction.