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+ | [[Image:Juan Fernandez Petrel Chile WatersMH.jpg|thumb|400px|right|Photo © by {{user|Michael+Hooper|Michael Hooper}}<br />Coast of Southern [[Chile]], 5 February 2020]] | ||
'''Alternative name: Pacific Petrel''' | '''Alternative name: Pacific Petrel''' | ||
;[[:Category:Pterodroma|Pterodroma]] externa | ;[[:Category:Pterodroma|Pterodroma]] externa | ||
==Identification== | ==Identification== | ||
− | + | 42·5–45 cm (17-18 in) , wingspan 95-97 cm. A large grey and white gadfly petrel, long-billed, dark-capped and with clean white underwings. | |
* White feathers on forehead with blackish bases (looking as dark spots), pattern extending to anterior superciliary area, plainer white on foreface | * White feathers on forehead with blackish bases (looking as dark spots), pattern extending to anterior superciliary area, plainer white on foreface | ||
* Blackish grey to dark brown-grey cap extending to most of ear-coverts and around eye (sometimes black there) | * Blackish grey to dark brown-grey cap extending to most of ear-coverts and around eye (sometimes black there) | ||
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* Black bill | * Black bill | ||
Sexes similar. Juveniles similar to adults. | Sexes similar. Juveniles similar to adults. | ||
+ | [[Image:Juan Fernandez Petrel at Sea Chile to Peru 21st March 2023 MH.jpg|thumb|350px|right|Photo © by {{user|Michael +Hooper|Michael Hooper}}<br />at sea between [[Chile]] and [[Peru]], 21 March 2023]] | ||
====Similar species==== | ====Similar species==== | ||
Distinguished from [[White-necked Petrel]] by lacking the bold and well-cut white hindcollar, also tends to be slightly darker on uppertail-coverts and tail and less blackish on anterior underwing, especially on carpal area.<br /> | Distinguished from [[White-necked Petrel]] by lacking the bold and well-cut white hindcollar, also tends to be slightly darker on uppertail-coverts and tail and less blackish on anterior underwing, especially on carpal area.<br /> | ||
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Migrates north, ranging over tropical and subtropical waters of eastern Pacific, north to [[Hawaii]]. Regularly off western [[Mexico]]. A Vagrant to [[New Zealand]] and eastern [[Australia]]. | Migrates north, ranging over tropical and subtropical waters of eastern Pacific, north to [[Hawaii]]. Regularly off western [[Mexico]]. A Vagrant to [[New Zealand]] and eastern [[Australia]]. | ||
==Taxonomy== | ==Taxonomy== | ||
− | This is a [[Dictionary_M- | + | This is a [[Dictionary_M-O#M|monotypic]] species.<br /> |
Has been considered a subspecies of [[Black-capped Petrel]] and often includes [[White-necked Petrel]]. | Has been considered a subspecies of [[Black-capped Petrel]] and often includes [[White-necked Petrel]]. | ||
+ | |||
==Habitat== | ==Habitat== | ||
A pelagic species, doesn't approach land except at breeding colonies.<br /> | A pelagic species, doesn't approach land except at breeding colonies.<br /> | ||
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A transequatorial migrant. | A transequatorial migrant. | ||
==References== | ==References== | ||
− | #{{Ref- | + | #{{Ref-Clements6thAug19}}#{{Ref-HBWVol1}} |
{{ref}} | {{ref}} | ||
==External Links== | ==External Links== | ||
{{GSearch|Pterodroma+externa}} | {{GSearch|Pterodroma+externa}} | ||
− | [[Category:Birds | + | {{GS-checked}}1 |
+ | <br /> | ||
+ | <br /> | ||
+ | |||
+ | [[Category:Birds]] [[Category:Pterodroma]] |
Latest revision as of 14:07, 8 August 2023
Alternative name: Pacific Petrel
- Pterodroma externa
Identification
42·5–45 cm (17-18 in) , wingspan 95-97 cm. A large grey and white gadfly petrel, long-billed, dark-capped and with clean white underwings.
- White feathers on forehead with blackish bases (looking as dark spots), pattern extending to anterior superciliary area, plainer white on foreface
- Blackish grey to dark brown-grey cap extending to most of ear-coverts and around eye (sometimes black there)
- Grey or brownish grey rest of upperparts, darker on most of upperwing and tail and with a dark transversal M (like other species of the group)
- Sometimes some spots or even a complete narrow and irregular whitish horseshoe between rump and uppertail-coverts
- Dark grey tips of remiges forming a narrow trailing edge on underwing
- Short blackish-grey and rather narrow crescent starting on carpal angle and not reaching central wing, white rest of carpal area, often with some blackish dots on primary coverts next to anterior edge of wing
- Dark grey exposed undertail with white bases and the outer pair has dark restricted to the distal third or less
- Grey large patch on underparts on side of neck connecting with mantle and forming a partial collar
- Black bill
Sexes similar. Juveniles similar to adults.
Similar species
Distinguished from White-necked Petrel by lacking the bold and well-cut white hindcollar, also tends to be slightly darker on uppertail-coverts and tail and less blackish on anterior underwing, especially on carpal area.
About the same size like Galapagos Petrel, but looks generally paler, greyer and more contrastingly patterned above. Also lacks the large blackish patch on carpal area.
Underparts similar like Bermuda Petrel, Barau's Petrel and Black-capped Petrel but easily told from all three species by much whiter underwing and by the latter lacking the broad and clear-cut white horseshoe on rear upperparts.
Similar in plumage to other species (like Masatierra Petrel and Stejneger's Petrel) but note the mostly white underwing and larger size.
Distribution
Breeds on Alejandro Selkirk Island (formerly Más Afuera Island) in Juan Fernandez Islands, Chile.
Migrates north, ranging over tropical and subtropical waters of eastern Pacific, north to Hawaii. Regularly off western Mexico. A Vagrant to New Zealand and eastern Australia.
Taxonomy
This is a monotypic species.
Has been considered a subspecies of Black-capped Petrel and often includes White-necked Petrel.
Habitat
A pelagic species, doesn't approach land except at breeding colonies.
Breeds rather high at 600-1000 m on slopes and ridges in fern forest or grassland.
Behaviour
Diet
Feeds probably mostly on fish and squid. Catches its prey by surface seizing, dipping, aerial pursuit and pattering.
Often associates with other seabirds or cetaceans. Occasionally around fishing boats.
Breeding
Breeding season starts October/November. Nests in burrows, lays 1 egg. Fledging mostly in May/June.
Movements
A transequatorial migrant.
References
- Clements, J. F., T. S. Schulenberg, M. J. Iliff, S. M. Billerman, T. A. Fredericks, B. L. Sullivan, and C. L. Wood. 2019. The eBird/Clements Checklist of Birds of the World: v2019. Downloaded from http://www.birds.cornell.edu/clementschecklist/download/
- Del Hoyo, J, A Elliot, and J Sargatal, eds. 1992. Handbook of the Birds of the World. Volume 1: Ostrich to Ducks. Barcelona: Lynx Edicions. ISBN 978-8487334108
Recommended Citation
- BirdForum Opus contributors. (2024) Juan Fernandez Petrel. In: BirdForum, the forum for wild birds and birding. Retrieved 27 September 2024 from https://www.birdforum.net/opus/Juan_Fernandez_Petrel
External Links
GSearch checked for 2020 platform.1