CHECKLIST OF ALASKA BIRDS 22nd edition—2016 As of 1 January 2016 the list of avian taxa known in Alaska included 510 naturally-occurring species in 65 families and 20 orders. Phylogenetic sequence, limits of orders and families, and English and scientific names of species follow The A.O.U. Check-list of North American Birds (7th ed., American Ornithologists’ Union 1998) and supplements (through 2015). Founded on archived specimens, this checklist increasingly includes new species known in Alaska only from (archived) photos, videotapes, and/or audio recordings. An appended “unsubstantiated” list comprises an additional 24 species –including two species pairs—attributed to Alaska without specimen or photo substantiation.