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Gavia pacifica

Gavia pacifica, Photo : John Mosesso / NBII.gov

Cladus: Eukaryota
Supergroup: Opisthokonta
Regnum: Animalia
Subregnum: Eumetazoa
Cladus: Bilateria
Cladus: Nephrozoa
Cladus: Deuterostomia
Phylum: Chordata
Subphylum: Vertebrata
Infraphylum: Gnathostomata
Superclassis: Tetrapoda
Classis: Aves
Subclassis: Carinatae
Infraclassis: Neornithes
Parvclassis: Neognathae
Ordo: Gaviiformes
Familia: Gaviidae
Genus: Gavia
Species: Gavia pacifica

Name

Gavia pacifica (Lawrence, 1858)

Vernacular names
Internationalization
Deutsch: Pazifiktaucher
English: Pacific Diver or Pacific Loon
Русский: Белошейная_гагара
Suomi: Tundrakuikka
Svenska: Stillahavslom
Türkçe: Pasifik dalgıcı

The Pacific Diver or Pacific Loon (Gavia pacifica), is a medium-sized member of the loon, or diver, family. It may be conspecific with Black-throated Diver/Arctic Loon, which it closely resembles.

It breeds on deep lakes in the tundra region of Alaska and northern Canada as far east as Baffin Island, and in Russia east of the Lena River.

Unlike other loons/divers, this bird may migrate in flocks. It winters at sea, mainly on the Pacific coast, or on large lakes over a much wider range, including China, Japan, North Korea, South Korea, USA and Mexico. It has occurred as a vagrant to Greenland, Hong Kong, Great Britain, Spain and Finland.[2]

Breeding adults are like a smaller sleeker version of Great Northern Diver/Common Loon. They have a grey head, black throat, white underparts and chequered black-and-white mantle. Non-breeding plumage is drabber with the chin and foreneck white. Its bill is grey or whitish and dagger-shaped. In all plumages, lack of a white flank patch distinguishes this species from the otherwise very similar Black-throated Diver/Arctic Loon.

This species, like all divers/loons, is a specialist fish-eater, catching its prey underwater. It flies with neck outstretched.

The call is a yodelling high-pitched wailing, as well as harsh growls and barks.
Pacific loon

References

^ BirdLife International (2008). Gavia pacifica. In: IUCN 2008. IUCN Red List of Threatened Species. Downloaded on 2008-11-04.
^ "Pacific Loon Spotted on Finnish Lake". YLE.fi. Yleisradio Oy. November 16, 2010. Retrieved January 29, 2011.


Further reading

The following articles deal with separation of Pacific Diver/Pacific Loon from Black-throated Diver/Arctic Loon:

Birch, A. and Lee, C-T, 1997, Field identification of Arctic and Pacific Loons, Birding 29: 106-115.
Birch, A and Lee, C-T, 1995, Identification of the Pacific Diver - a potential vagrant to Europe, Birding World 8: 458-466.
Harrison, Seabirds ISBN 0-7470-8028-8

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Source: Wikipedia, Wikispecies: All text is available under the terms of the GNU Free Documentation License