The Audubon field guides have sold over 18 million copies since Alfred A. Knopf published the first illustrated and descriptive books in 1934. This informative website, which features beautiful drawings and photographs as well as extensive descriptions of birds from around North America, is intuitive and pleasing to the eye. Readers can start by typing the name of a bird into the search function, or by sorting the guide by taxonomic family or region. Each record provides detailed information, including facts about Habitat, Migration, and Feeding Behavior. Perhaps best of all, a Songs and Calls section lets readers experience the song of the Acadian Flycatcher or the rhythms of the Acorn Woodpecker.[--SAMPLE RECORD--]