The avifauna of the Aleutian Islands included 376 species according to Gibson and Byrd (2007), Bird Checklists of the World (Avibase), and the American Ornithological Society (AOS) as of March 2021.[1][2][3]
Of them, 44 (12%) are year-round residents and breeders, 26 (7%) migrate to the Aleutians to breed, 18 (5%) migrate to the Aleutians to winter, 6 (2%) are non-breeding summer residents, 37 (10%) are annual through-migrants, 196 (53%) are vagrants of less-than-annual occurrence. The status of the remaining 42 is not noted by either Gibson and Byrd or Avibase. Several of the vagrants have only a single record.
This list is presented in the taxonomic sequence of the Check-list of North and Middle American Birds, 7th edition through the 62nd Supplement, published by the AOS.[3] Common and scientific names are also those of the Check-list, except that the common names of families are from the Clements taxonomy because the AOS list does not include them.
The following terms are used to denote the annual and seasonal status of each species reported by Gibson and Byrd (2007), or in the case of "Accidental", noted as such for species added from Avibase:
Accidental – one or two records
Casual – recorded in less than 30% of years in the appropriate season, but in at least three calendar years
Intermittent – recorded in 30% or more years in the appropriate season, but not annually
Migrant – annual through-migrant in spring or fall
Resident – substantial numbers present throughout the year
Summer – migrates to the Aleutians to breed or to summer offshore
Winter – migrates to the Aleutians to winter
Annual breeders are designated with an asterisk (*), as in resident* or summer*.
^Gibson, Daniel D.; Byrd, G. Vernon (2007). Birds of the Aleutian Islands, Alaska. Series in Ornithology 1. Nuttall Ornithological Club and American Ornithologists' Union.
^Lepage, Denis (March 13, 2021). "Checklist of Birds of the Aleutian Islands". Avibase bird checklists of the world. Retrieved August 12, 2021.
^ ab"Check-list of North and Middle American Birds". American Ornithological Society. June 29, 2021. Retrieved August 9, 2021.
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