The American Birding Association (ABA) is "a non-profit organization that provides leadership to birders by increasing their knowledge, skills and enjoyment of birding." The ABA maintains a checklist for its area which is carefully assessed and regularly updated.
The complete ABA checklist refers to North America north of the Mexican border. It excludes Bermuda, the Bahamas, Hawaii and Greenland. Within BUBO Listing, the ABA authority can be applied to lists for Continental North America (i.e. the "ABA Area") and certain sub-units thereof.
The most recent update of the ABA list was version 7.8 from August 2015. The latest updates have not been fully incorporated: although species additions and deletions have been done, there are still some changes to English and scientific names, and many changes to systematic order and the families to which species were assigned, that have not yet been processed.