Official source on the taxonomy of birds found in North and Middle America, including adjacent islands. The full list of bird species (with scientific and English names) is online in HTML, .pdf, and Excel formats.
An extensive database information system about all birds of the world, containing nearly 1 million records about 10,000 species and 22,000 subspecies of birds, including distribution information, taxonomy, and synonyms in several languages.
Worldwide database compiled from the ornithological literature of birds with two different species as parents. Includes complete references for each species combination. In English, French, and Spanish.