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 the 21st published report of the ABA Checklist Committee (CLC), covering the period August 2009 to September 2010. This resulted in seven new species being added (Bare-throated Tiger-Heron Tigrisoma mexicanum, Solitary Snipe Gallinago solitaria, Amazon Kingfisher Chloroceryle amazona, Gray-collared Becard Pachyramphus major, Brown-backed Solitaire Myadestes occidentalis, Rufous-tailed Robin Luscinia sibilans and Red-legged Thrush Turdus plumbeus), plus acceptance of two AOU splits (Eastern/Mexican Whip-poor-will and Winter/Pacific Wren).