The AOS Check-list of North American Birds provides the taxonomic and nomenclatural foundation for bird research, conservation, and education in North and Middle America. It is used by scientific researchers, federal, state, and local government agencies, non-profit organizations, birdwatchers, and anyone else interested in birds of this region. It is overseen by AOS’s North American Classification Committee (NACC).
Recommended citation (65th Supplement): Chesser, R. T., S. M. Billerman, K. J. Burns, C. Cicero, J. L. Dunn, B. E. Hernández-Baños, R. A. Jiménez, O. Johnson, A. W. Kratter, N. A. Mason, and P. C. Rasmussen. 2024. Check-list of North American Birds (online). American Ornithological Society. https://checklist.americanornithology.org/
The geographic area covered by the AOS Check-list includes North and Central America from the North Pole to the boundary of Panama and Colombia, including the adjacent islands under the jurisdiction of the included nations; Greenland; the Hawaiian Islands; Clipperton Island; Bermuda; the West Indies, including the Bahama Islands, the Greater Antilles, Leeward and Windward Islands in the Lesser Antilles (ending with Grenada); and Swan, Providencia, and San Andrés Islands in the Gulf of Mexico.
In addition to accessing the online version of the checklist through the link above, the 829-page hardbound volume, published in 1998, may be purchased from Buteo Books or downloaded in PDF format (file size up to 13 MB):
These documents do not incorporate changes made in the annual supplements to the Check-list. Users of the book must check the supplements or online list to determine whether changes have been made.
Individual open-access supplements published since the 7 th edition:
The last edition of the Check-list to include subspecies was published in 1957 (5th edition). For reasons of expediency, the Committee reluctantly excluded treatment of subspecies in both the 6th and 7th editions, although it continues to endorse the biological reality and practical utility of subspecies as a taxonomic rank. Subspecies that reflect biological diversity play an important role in flagging the attention of evolutionary, behavioral, ecological, and conservation biologists.
Although a complete revision of North American avian subspecies has not been done, we refer readers to Avibase, Clements, and other checklists (see below), as well as to Birds of North America, for more up-to-date treatments of subspecies. The Birds of North America project is systematically revising subspecies accounts for North American birds.