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Endangered Species

Nature Serve

Scientific data on endangered species and threatened ecosystems provided by an international network of conservation data centers operating in all 50 U.S. states, Canada, Latin America and the Caribbean.

Center for Plant Conservation

American plant conservation resource directory and Guide to the National Endangered Plant Collection.

IUCN Red List of Threatened Species

The International Union for Conservation of Nature has for more than four decades been assessing the conservation status of species on a global scale in order to highlight taxa threatened with extinction, and therefore promote their conservation.