Cassin's Auklet Ptychoramphus aleuticus

Family: Alcidae (Auks)

Authority: (Pallas, 1811)

Red List Category

Criteria: A2b+3b+4b

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Justification of Red List category
This species has been uplisted to Near Threatened because the global population decline is likely to approach 30% in three generations (23 years). If the decline is found to be larger then the species could qualify for further uplisting; it almost meets the requirements for listing as threatened under criteria A2b+3b+4b.

Population size: 2500000-4999999

Population trend: Decreasing

Extent of occurrence (breeding/resident): 8,620,000 km2

Country endemic: No

Realm - Nearctic
IUCN Ecosystem -- Marine biome

Recommended citation
BirdLife International (2018) Species factsheet: Ptychoramphus aleuticus. Downloaded from http://www.birdlife.org on 17/11/2018. Recommended citation for factsheets for more than one species: BirdLife International (2018) IUCN Red List for birds. Downloaded from http://www.birdlife.org on 17/11/2018.