Birds of North America. Provides comprehensive life histories for each of the 700+ species of birds breeding in the US (including Hawaii) and Canada.
Borror Laboratory of Bioacoustics, Digital Animal Sounds. Contains digitized audio recordings of songbirds. Additional animal and bird sounds will be added as they are digitized. The Borror Laboratory houses one of the largest collections of recorded animal sounds in the world with more than 30,000 recordings of some 1000 species.