Cook's Petrel Pterodroma cookii

Family: Procellariidae (Petrels, Shearwaters)

Authority: (Gray, 1843)

Red List Category

Criteria: A2e;D2

Click here for more information about the Red List categories and criteria

Justification of Red List category
This species is listed as Vulnerable because, although there have been rapid declines in the past, the improving status of the population and habitat, 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. Although tiny numbers still occur on Great Barrier Island it may have been effectively extinct as a reproductively viable population for several decades.

Population size: 670000

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 (2018) Species factsheet: Pterodroma cookii. Downloaded from on 16/11/2018. Recommended citation for factsheets for more than one species: BirdLife International (2018) IUCN Red List for birds. Downloaded from on 16/11/2018.