Red-legged Kittiwake
Rissa brevirostris
Crisp small gull with very limited range; breeds on rocky cliffs on islands in the Bering Sea, from Alaska to Russia; winters on open ocean. Size and plumage most similar to Black-legged Kittiwake, but back is darker gray, yellow bill is shorter, legs are shorter and bright red, and underwing is darker gray. Nonbreeding birds have a dark smudge around eye and a thin gray ear patch. Young birds are similar to nonbreeding adults but with black bill, duller legs, and more contrasting wing pattern.
识别特征
The red-legged kittiwake is a very localised subarctic Pacific species. Apart from the distinguishing feature implicit in its name, it is very similar to its better-known relative, the black-legged kittiwake; other differences include the shorter bill, larger eyes, a larger, rounder head, and darker grey wings, and in the juveniles, which barely differ from the adults, lacking the black tail band and "W" across the wings of juvenile black-legged kittiwakes. Juveniles take three years to reach maturity. Adults are 35–39 cm (14–15 in) long, with an 84–92 cm (33–36 in) wingspan and a body mass of 325–510 g (11.5–18.0 oz).<p>Like the Pacific race of black-legged kittiwakes, the red-legged kittiwake has a well-developed hind toe. As occasional individual black-legged kittiwakes have reddish legs, any reports of red-legged away from the subarctic Pacific must record all of the other differences, not just the leg colour, for acceptance by bird recording authorities.
分类信息
Genus: Rissa; Family: Laridae; Order: Charadriiformes.
- 学名
- Rissa brevirostris
- 命名信息
- (Bruch, 1855)
- 目
- Charadriiformes
- 科
- Laridae
- 属
- Rissa
分布与栖息地
Breeding range: NA : Commander Is. (se Russia), Aleutian and Pribilof is., and St. Matthew I. (n Bering Sea). Non-breeding range: Bering Sea to ice-edge and s of Aleutian Is..
- 繁殖区
- NA : Commander Is. (se Russia), Aleutian and Pribilof is., and St. Matthew I. (n Bering Sea)
- 非繁殖区
- Bering Sea to ice-edge and s of Aleutian Is.
- 迁徙
- Complete migrants
行为
Migration pattern: Complete migrants.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
鸟叫声
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