# Cook's petrel
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> Source: https://en.wikipedia.org/wiki/Cook's_petrel
> Source revision: 1345512773
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{{Short description|Species of bird}}
{{Use New Zealand English|date=September 2025}}
{{speciesbox
|image = Cook's Petrel 0A2A7458.jpg
| status = VU
| status_system = IUCN3.1
| status_ref = [{{cite iucn |author=BirdLife International |date=2018 |title=''Pterodroma cookii'' |volume=2018 |article-number=e.T22697975A132616449 |doi=10.2305/IUCN.UK.2018-2.RLTS.T22697975A132616449.en |access-date=13 November 2021}}]
| genus = Pterodroma
| species = cookii
| authority = ([G.R. Gray](/source/George_Robert_Gray), 1843)
| range_map = Pterodroma cookii map.svg
| synonyms = ''Procellaria cookii'' G. R. Gray, 1843
''Procellaria velox'' G. R. Gray, 1844 (''nomen novum'')
''Pterodroma cookii orientalis'' Murphy, 1929
}}
'''Cook's petrel''' ('''''Pterodroma cookii''''') or '''tītī''' ([Māori](/source/M%C4%81ori_language)), '''blue-footed petrel''', is a [Procellariiform](/source/Procellariiform) [seabird](/source/seabird) endemic to New Zealand.[{{cite web |title=Cook's petrel {{!}} New Zealand Birds Online |url=http://nzbirdsonline.org.nz/species/cooks-petrel}}] It is a member of the [gadfly petrel](/source/gadfly_petrel)s and part of the subgenus ''Cookilaria'' Bonaparte, 1856, which includes the very similar [Stejneger's petrel](/source/Stejneger's_petrel).
==Morphology==
[[File:Pterodroma cookii (AM LB4167-1).jpg|alt=Cook's petrel mount from the collection of Auckland Museum|left|thumb|Cook's petrel mount from the collection of [Auckland Museum](/source/Auckland_War_Memorial_Museum)]]
One of the smallest petrels, Cook's petrel is typically {{convert|25|-|30|cm|in|abbr=on}} in length with a {{Convert|65|-|66|cm|in|abbr=on}} wingspan and a weight of around {{convert|200|g|oz|abbr=on}}. Its colouration is typical of gadfly petrels: pale grey upperparts with a dark grey "M" on the wings and white underparts.[
The bill is long and black with tubular nostrils on both sides. As in all members of the order Procellariiformes, this nostril configuration enables an exceptionally acute sense of smell, which the birds use to locate food and nest sites in the dark.
== Diet ==
Cook's petrel feeds mostly on [fish](/source/fish) and [squid](/source/squid), with some [crustaceans](/source/crustaceans) taken{{Citation needed|date=November 2011}}. The species is highly [pelagic](/source/pelagic) except when [nesting](/source/Bird_nest).
==Habitat==
thumb|left|Cook's petrel photographed in Hauraki Gulf, New Zealand
Cook's petrel breeds only in [New Zealand](/source/New_Zealand) on three small islands: [Little Barrier Island](/source/Little_Barrier_Island), [Great Barrier Island](/source/Great_Barrier_Island), and [Codfish Island](/source/Codfish_Island).][{{Cite Q|Q106839633}}] The breeding season is the southern summer, October–May.[Harrison, P.; Perrow, M.; Larsson, H. (2021). Seabirds: The New Identification Guide. Lynx Edicions, Barcelona. 1-600 (400).] The species was formerly more numerous; the current population estimate is 1,258,000 and declining. It is classified as vulnerable because it breeds on only three small islands. While [Little Barrier Island](/source/Little_Barrier_Island)'s population remains stable, the other two populations are decreasing. On Great Barrier Island, introduced pigs, dogs, rats and cats attack nests and burrows, as do native [weka](/source/weka) (a flightless rail), preying on eggs and nestlings and reducing the population from an estimated 20,000 to 100{{Citation needed|date=November 2011}}. Fossils show that prior to the arrival of humans to New Zealand, Cook's petrel used to breed on the mainland New Zealand [North](/source/North_Island) and [South Island](/source/South_Island)s.[{{cite book |last1=Robertson |first1=Hugh |last2=Barrie |first2=Heather |title=The Hand Guide to the Birds of New Zealand |year=1999 |publisher=Penguin |isbn=978-0-19-850831-1}}]
}}
{{refbegin}}
* {{cite book |publisher=National Geographic |title=Field Guide to the Birds of North America |year=2002 |isbn=0-7922-6877-6}}
* {{cite book |title=Seabirds, an Identification Guide |first=Peter |last=Harrison |year=1985 |publisher=Houghton Mifflin |isbn=0-395-60291-2}}
* {{cite book |title=Handbook of the Birds of the World |date=1992 |volume=1 |editor-first=Josep |editor-last=del Hoyo |isbn=84-87334-10-5 |url-access=registration |url=https://archive.org/details/handbookofbirdso0001unse }}
*{{cite book |last=Sibley |first=David Allen |author-link=David Allen Sibley |date=2000 |title=The Sibley Guide to Birds |location=New York |publisher=Knopf |page=[https://archive.org/details/sibleyguidetobir00sibl_0/page/483 483] |isbn=0-679-45122-6 |url-access=registration |url=https://archive.org/details/sibleyguidetobir00sibl_0/page/483 }}
{{refend}}
==External links==
{{Commons category|Pterodroma cookii}}
{{Wikispecies|Pterodroma cookii}}
* {{BirdLife|22697975|Pterodroma cookii}}
* {{Avibase|name=Pterodroma cookii}}
* {{InternetBirdCollection|cooks-petrel-pterodroma-cookii}}
* {{VIREO|Cook's+petrel}}
* {{IUCN_Map|22697975/132616449|Pterodroma cookii}}
* {{Xeno-canto species|Pterodroma|cookii|Cook's petrel}}
{{Taxonbar|from=Q596787}}
Cook's petrel
Category:Birds of New Zealand
Category:Birds of the Cook Islands
Cook's petrel
Cook's petrel
{{Procellariiformes-stub}}
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Adapted from the Wikipedia article [Cook's petrel](https://en.wikipedia.org/wiki/Cook's_petrel) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Cook's_petrel?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.