BIRDNET is an online repository of information about the science of ornithology, and about issues of interest to ornithologists. The site is intended to provide information to professional ornithologists, and to members of the general public interested in learning more about both the scientific study of birds and the application of information from that study to conservation and other problems affecting or associated with birds. BIRDNET is maintained by the Ornithological Council.
Birds of North America Online (BNA Online) is the most comprehensive and current reference work detailing the life histories of North American birds. The series provides detailed scientific information for each of the 716 species of birds nesting in the USA and Canada. The species accounts are updated frequently and include image, sound and video galleries showing behaviors. Accounts include songs and calls from the extensive collection in Cornell's Macaulay Library of Natural Sounds.
The International Ornithological Union's list of the extant birds of the world that is updated regularly to include changes of names or classification, additions of newly described species as well as proposed splits and lumps, and taxonomic comments.