Family: Alcidae (Auks)

Authority: (Green and Arnold, 1939)

Red List Category

Criteria: B2ab(iv,v)

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Justification of Red List category
This species is listed as Vulnerable because it occupies a small range when breeding, nests on a limited number of islands and islets and is thought to be in on-going decline owing mainly to the impacts of invasive mammalian predators. Predator eradication is currently ongoing however and if a population recovery is evidenced, this species may qualify for downlisting to a lower threat category. Similarly, if the species is confirmed to be breeding at more than 10 locations, downlisting may also be warranted. Until such confirmation however, the species is precautionarily retained as Vulnerable.

Population size: 10000-19999 mature individuals

Population trend: decreasing

Extent of occurrence (breeding/resident): 217,000 km²

Country endemic: no