The EOL is a global effort to gather knowledge about all species on earth.

Provides taxonomic, conservation status and distribution information on plants and animals that have been globally evaluated using the IUCN Red List Categories and Criteria.

National Invasive Species Information Center (NISIC): gateway to invasive species information; covering Federal, State, local, and international sources.

The goal of the Species 2000 project is to create a validated checklist of all the world's species (plants, animals, fungi and microbes).

Here you will find authoritative taxonomic information on plants, animals, fungi, and microbes of North America and the world.