Canada (P), Hong Kong (China), Indonesia, Russia (Asian), Singapore, USA (B).
Vagrant to United Kingdom.
Unknown to Japan, Malaysia, Philippines.
Sakhalin through Sea of Okhotsk to Kamchatka and perhaps other sites in Bering Sea; Alaska, on Bering and Pacific coasts, from Chukchi Sea and Kotzebue Sound south to Aleutian Is, and east to delta of Copper R and Dry Bay; has bred in Japan (Hokkaido). Main wintering area unknown, although some birds in Philippines.
 
Population
Estimated population is 30,000 - 35,000 (2010).
Aleutian Tern (Onychoprion aleuticus) [XC401884]
by Steve Hampton from Noglikskiy Rayon, Sakhalinskaya oblast', Russian Federation (alarm call, flight call)
Aleutian Tern (Onychoprion aleuticus) [XC489797]
by Albert Lastukhin from Noglikskiy Rayon, Sakhalin Oblast, Russian Federation (flight call)
Subspecies
No subspecies.
Similar Species
Common Tern (Sterna hirundo)
Non-breeding with non-breeding. Lores are white. Crown is white with a blackish nape. Wings and back are paler grey. Trailing edge of underwing secondaries lack a dark band.
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