Birds of Adak

Seasonal Status Definitions

Permanent Resident
Species who breed on Adak and do not migrate (or migrate very little) and remain year-round. Ie. Pacific Wren, Rock Ptarmigan.

Year-round Resident and Migrant
Species who breed on Adak, some of whom migrate, but whose northern and southern populations overlap, therefore creating an appearance of permanent status, but individuals in the summer are often different than the winter birds. This also includes non-breeders like Harlequin Duck which are seen year-round.

Migrant and Breeder
Species who breed on Adak, but leave for winter. Ie. Terns, Longspurs.

Migrant and Winter Resident
Species who do not breed on Adak, but arrive in the fall and spend the winter. Ie. Emporer Goose, many species of waterfowl.

Migrant
Species who neither breed nor winter here, but just pass through during spring and fall migration. Ie. Western Sandpiper, Sanderling.

Out of Range
Species whose normal range does not include Adak, but somehow show up here. Ie. Common Greenshank, Brambling..

Occurrence Definitions

  Regular: Recorded every year
  Irregular: Not recorded every year, but at least once every 2 or 3 years
  Casual: 3 or more years between records, but recorded on Adak at least ten times ever
  Accidental: Recorded fewer than 10 times or not recorded in the last ten years

Abundance Definitions

  Abundant: 100 + per day
  Fairly Common: 26 to 99 per day
  Common: 6 to 25 per day
  Uncommon: Up to 5 per day, up to 25 per season
  Rare: 1 to 5 per day, up to 5 per season

Asian Stray

A species normally found in Asia (or anywhere outside of North America)

Abundance:
Occurrence:
Seasonal Status:
Asian Stray:	Yes