East Siberian Gull

:"Vega Gull redirects here. For the aircraft, see Percival Vega Gull"Taxobox
name = East Siberian Gull
regnum = Animalia
phylum = Chordata
classis = Aves
ordo = Charadriiformes
familia = Laridae
genus = "Larus"
species = "L. vegae"
binomial = "Larus vegae"
binomial_authority = Palmén, 1887, northeastern Siberia

The East Siberian Gull, "Larus vegae", is a large gull of the Herring Gull/Lesser Black-backed Gull complex which breeds in East Asia. Its classification is still controversial and uncertain. There are at least two subspecies: Vega Gull, "Larus (argentatus) vegae", and Mongolian Gull, "Larus (vegae/cachinnans/argentatus) mongolicus". Both of these may be classified as separate species or they may be treated as subspecies of other related gulls, e.g. Mongolian Gull as a subspecies of the Caspian Gull, "Larus cachinnans".

Vega Gull

Vega Gulls breed in north-east Siberia and winter in Japan, Korea, south and east China and Taiwan. They are regularly seen on St. Lawrence Island and Nome, Alaska and may breed there. There are also records from other parts of western Alaska, and a few photo documented records from Washington and California. In their winter range they are typically found in harbours, on rocky shores and at river mouths.

They are similar to Herring Gulls but are slightly darker grey above. The head is heavily streaked with brown in winter, especially on the back and sides of the neck forming a collar. The legs are usually bright pink. Eye colour is variable but tends to be dark with a red orbital ring. There are rarely any dark marks on the pale yellow bill.

Vega Gulls in the north-western part of their breeding range are paler above. They are sometimes considered to form a separate subspecies "Larus vegae birulai" (Birula's Gull).

Mongolian Gull

The Mongolian Gull nests in Mongolia, neighbouring parts of Russia (such as Lake Baikal), north-east China (e.g. Lake Hulun) and possibly South Korea. It migrates south-east to winter in south and east China and Korea with small numbers reaching Japan. In South Korea it winters on inland waters more often than the Vega Gull.

The back and wings vary in colour. They are often medium grey similar to Birula's Gull but can be much darker. The head is mainly white all year round with only faint winter streaking. The legs are usually pink and the eye is usually pale with a red orbital ring. The bill is yellow with a large red spot and often with dark markings.

References

* Paul Doherty & Bill Oddie (2001) "Gulls: A Video Guide to the Gulls of Europe, Asia & North America". Videocassette. Bird Images.
*John MacKinnon & Karen Phillipps (2000) "A Field Guide to the Birds of China". Oxford University Press.
*Craig Robson (2002) "A Field Guide to the Birds of South-East Asia". New Holland, London.
*George C. West (2002) "A Birder's Guide to Alaska". American Birding Association.

External links

* [http://www23.tok2.com/home/jgull/mongolicus/index.html Mongolian Gull photos] , Japanese Gull-Site
* [http://www.birdskorea.org/lwhgid.asp The "Herring Gull" Assemblage in South Korea] , Birding Korea
* [http://larus.hp.infoseek.co.jp/vega.html Vega Gull photos] , Japanese Gull-Site