Biology: Taxonomy and Identification

"Online guide to birds and birdwatching." This site includes recordings of bird song.

AmphibiaWeb provides information on amphibian declines, natural history, conservation, and taxonomy

The Catalogue of Life is the most comprehensive and authoritative global index of species currently available. It consists of a single integrated species checklist and taxonomic hierarchy. The Catalogue holds essential information on the names, relationships and distributions of over 1.5 million species, in eight kingdoms. This figure continues to rise as information is compiled from diverse sources around the world.

(32900 Species, 304000 Common names, 55300 Pictures

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

Species range maps and occurrence data.

A comprehensive list of all living reptile species.