Aleutian Tern Onychoprion aleuticus

Family: Laridae (Gulls, Terns, Skimmers)

Authority: (Baird, 1869)

Red List Category

Criteria: A2bcde+3bcde+4cde

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Justification of Red List category
This tern of the northern Pacific Ocean coasts has undergone very rapid population declines at its Alaskan breeding colonies. Trends in Russia are less clear, but it is likely that overall the species is undergoing rapid declines over three generations, and it is therefore listed as Vulnerable. Precise drivers of declines are unclear, but likely include habitat modification, predation, egg harvesting and human disturbance.

Population size: 31000 mature individuals

Population trend: decreasing

Extent of occurrence (breeding/resident): 6,660,000 km2

Country endemic: no

USFWS - Bird of Conservation Concern
Realm - Indomalayan
Realm - Nearctic
Realm - Palearctic
IUCN Ecosystem -- Freshwater biome
IUCN Ecosystem -- Terrestrial biome
IUCN Ecosystem -- Marine biome

Recommended citation
BirdLife International (2023) Species factsheet: Onychoprion aleuticus. Downloaded from on 06/12/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from on 06/12/2023.