Cook's Petrel Pterodroma cookii

Family: Procellariidae (Petrels, Shearwaters)

Authority: (Gray, 1843)

Red List Category

Criteria: A2e; D2

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Justification of Red List category
There have been rapid declines in the past, but the status of the species has improved, in particular following the successful eradication of the last introduced predators (Pacific rat Rattus exulans) on Little Barrier Island (where by far the largest numbers breed), leading to an increase in fledging success from 5% to 70%. This key step in turning the fortunes of the species followed the earlier eradication of cats from Little Barrier Island in 1980, and Weka Gallirallus australis from Codfish Island in the early 1980s. The species is still restricted to a very small number of breeding locations, and if invasives should become established again on Little Barrier Island, extremely rapid population declines could ensue. Therefore, the species qualifies as Vulnerable.

Population size: 670000 mature individuals

Population trend: increasing

Extent of occurrence (breeding/resident): 139,000,000 km2

Country endemic: yes

Land-mass type - oceanic island
Realm - Nearctic
Realm - Neotropical
Realm - Oceanic
IUCN Ecosystem -- Terrestrial biome
IUCN Ecosystem -- Marine biome

Recommended citation
BirdLife International (2023) Species factsheet: Pterodroma cookii. Downloaded from on 07/12/2023.
Recommended citation for factsheets for more than one species: BirdLife International (2023) IUCN Red List for birds. Downloaded from on 07/12/2023.