Developer: AvibirdsType: ID tool
This online bird guide consists of over 2700 bird species. Physical characteristics, habitat, migration, distribution and more are described.
Almost every page contains a video, sound fragment, picture and distribution map. For most species scientific literature is available, the articles are in pdf format to download. All European species have been added, as well over 550 North American species. The latter is by no means complete, but a work in progress.