• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Taxonomic source(s)
Brooke, M. de L. 2004. Albatrosses and Petrels Across the World. Oxford University Press, Oxford.
Christidis, L. and Boles, W.E. 2008. Systematics and Taxonomy of Australian Birds. CSIRO Publishing, Collingwood, Australia.
del Hoyo, J., Collar, N.J., Christie, D.A., Elliott, A. and Fishpool, L.D.C. 2014. HBW and BirdLife International Illustrated Checklist of the Birds of the World. Volume 1: Non-passerines. Lynx Edicions BirdLife International, Barcelona, Spain and Cambridge, UK.
SACC. 2005 and updates. A classification of the bird species of South America. Available at: https://www.museum.lsu.edu/~Remsen/SACCBaseline.htm.
Turbott, E.G. 1990. Checklist of the Birds of New Zealand. Ornithological Society of New Zealand, Wellington.

Red List criteria met

Critically Endangered	Endangered	Vulnerable
-	-	A2e; D2

Red List history

Year	Category	Criteria
2018	Vulnerable	A2e; D2
2016	Vulnerable	A2e;D2
2012	Vulnerable	A2e;D2
2010	Vulnerable	A2e; D2
2009	Vulnerable	D2
2008	Endangered
2007	Endangered
2006	Endangered
2004	Endangered
2000	Endangered
1996	Vulnerable
1994	Vulnerable
1988	Threatened

Migratory status	full migrant	Forest dependency	high
Land-mass type		Average mass	-

	Estimate	Data quality
Extent of Occurrence (breeding/resident)	139,000,000 km2	medium
Area of Occupancy (breeding/resident)	320 km2	medium
Number of locations	2	-
Severely fragmented?	no	-

	Estimate	Data quality	Derivation	Year of estimate
Population size	670000 mature individuals	good	estimated	2008
Population trend	increasing	good	suspected	-
Rate of change over the past 10 years/3 generations (longer of the two periods)	30-49%	-	-	-
Generation length	15.6 years	-	-	-
Number of subpopulations	2	-	-	-
Percentage of mature individuals in largest subpopulation	95-99%	-	-	-

Population justification: M. Rayner (in litt. 2012) estimates over 650,000 mature individuals on Little Barrier in 2007 and c.15,000 mature individuals on the Cod fish Islands in 2008, thus the total population estimate is rounded to c.670,000 mature individuals.

Trend justification: The population has suffered rapid declines in the past owing to the effects of introduced predators; however, thanks to conservation action and invasive species eradications it is now estimated to be increasing.

Country/Territory	Presence	Origin	Resident	Breeding visitor	Non-breeding visitor	Passage migrant
American Samoa	extant	native			yes
Australia	extant	vagrant
Canada	extant	vagrant			yes
Chile	extant	native			yes
Cook Islands	extant	native			yes
Ecuador	extant	uncertain
French Polynesia	extant	native			yes
French Southern Territories	extant	uncertain
High Seas	extant	native			yes
Kiribati	extant	vagrant
Mexico	extant	native			yes
New Caledonia (to France)	extant	uncertain
New Zealand	extant	native		yes
Niue (to New Zealand)	extant	native			yes
Norfolk Island (to Australia)	extant	native			yes
Peru	extant	native	yes
Pitcairn Islands (to UK)	extant	native			yes
Samoa	extant	uncertain
Tokelau (to New Zealand)	extant	uncertain
Tonga	extant	uncertain
Tuvalu	extant	uncertain
United States Minor Outlying Islands (to USA)	extant	native			yes
USA	extant	native		yes	yes
Wallis and Futuna Islands (to France)	extant	native			yes

Country/Territory	IBA Name
High Seas	Pacific, Eastern Central 3 - Marine
New Zealand	Hirakimata Kotuku Peninsula
New Zealand	North Auckland Seabird Flyway
New Zealand	North Eastern North Island (offshore)
New Zealand	Rakiura (offshore)
New Zealand	Te Hauturu-o-Toi Little Barrier Island
New Zealand	Whenua Hou Codfish Island
Peru	Reserva Nacional de Paracas

Habitat (level 1)	Habitat (level 2)	Importance	Occurrence
Forest	Temperate	major	breeding
Marine Neritic	Pelagic	major	non-breeding
Marine Neritic	Pelagic	major	breeding
Marine Oceanic	Epipelagic (0-200m)	major	non-breeding
Marine Oceanic	Epipelagic (0-200m)	major	breeding
Altitude	0 - 700 m	Occasional altitudinal limits

Threat (level 1)	Threat (level 2)	Impact and Stresses
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Felis catus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Gallirallus australis	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Species mortality
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus exulans	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Reduced reproductive success
Invasive and other problematic species, genes & diseases	Invasive non-native/alien species/diseases - Rattus rattus	Timing		Scope		Severity		Impact
		Ongoing		Minority (<50%)		Slow, Significant Declines		Low Impact: 5
		Stresses Reduced reproductive success

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Recommended citation
BirdLife International (2024) Species factsheet: Cook's Petrel Pterodroma cookii. Downloaded from https://datazone.birdlife.org/species/factsheet/cooks-petrel-pterodroma-cookii on 22/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 22/12/2024.