Ross's Gull
Rhodostethia rosea
Long-winged, wedge-tailed, delicate seabird of far northern climates, nesting in open wet tundra and wintering around sea ice, occasionally moving into coastal areas. Breeding adult astonishingly beautiful: pearly gray above, rose-pink below, with coral-red legs, thin black collar, and tiny black bill. Nonbreeding adult has a tiny black dot near the ear and loses the black collar and much or all of the pink coloration. First-winter birds have blackish “M” pattern in upperwing and black tip on wedge-shaped tail. Flight graceful and buoyant.
识别特征
This small bird is similar in size and some plumage characteristics to the little gull. It is slightly larger and longer winged than the little gull species, and has more-pointed wings and a wedge-shaped tail. Its legs are red. Summer adults are pale grey above and white below, with a pink flush to the breast, and a neat black neck ring. In winter, the breast tints and neck collar are lost and a small dark crescent develops behind the eye.<p>Young birds resemble winter adults, but have a dark "W" pattern on the wings in flight, like young little gulls. The juveniles take two years to attain full adult plumage.<p>Ross's gull measurements:
分类信息
- 学名
- Rhodostethia rosea
- 命名信息
- (MacGillivray, W, 1824)
- 目
- Charadriiformes
- 科
- Laridae
- 属
- Rhodostethia
分布与栖息地
Ross's gull breeds in the high Arctic of northernmost North America, and northeast Siberia. It migrates only short distances south in autumn, most of the population wintering in northern latitudes at the edge of the pack ice in the northern Bering Sea and in the Sea of Okhotsk, although some birds reach more temperate areas, such as north west Europe; in February 2016 they were sighted in Cornwall and Ireland according to the BTOs 'BirdTrack', in December 2021 two were seen in Belgium, one in Nieuwpoort and one in Zeebrugge. In North America, a Ross's gull has been spotted as far south as Salton Sea in California, although sightings this far south are extremely rare. The summer breeding grounds are tundra with sedges, grass tussocks, dwarf willows, bushes, lichens and pools.
- 繁殖区
- PAL, NA : w, e Greenland (rare); Arctic ne Siberia, locally from Taimyr Pen. to Kolyma River; Arctic ne Canada and formerly Churchill, Manitoba (wc Hudson Bay, ec Canada)
- 非繁殖区
- Arctic Ocean, in Beaufort (n of Alaska) and Labrador seas (at least)
- 迁徙
- Complete migrants
保护状况
- 种群趋势
- unknown
照片
分布
鸟叫声
其他鸟类
Little Hermit
Phaethornis longuemareus
Tiny, mostly warm brown hummingbird. Note distinctive curved bill; long, white central tail feathers; and dark brown throat. Found in understory of swampy forest, including second growth and abandoned plantations, primarily in coastal areas. Forages on nectar, visiting widely-spaced food sources and often seen flying between them in low, direct flight, giving a characteristic plaintive squeak. At close range, often detected by loud and erratic wing noise, like a large bee, as it weaves among understory plants. May pause briefly to investigate people. Males sing from low perches; song is a series of high, slurred notes with a distinctive pattern. Most similar to Reddish Hermit, but Little is much less rufous, lacks a black breast band, and is generally restricted to coastal swamp forests.
Plain-colored Tanager
Tangara inornata
Well-named, plain gray with black wings and dark mask. Iridescent blue-purple shoulder is usually not visible. Most similar to Palm Tanager but grayer (not olive) without pale patch at base of primaries. Also could be confused with Blue-gray Tanager in poor light, but Plain-colored's dark wings are more contrasting. Sexes alike. Seen in pairs or small flocks in open woody habitats like forest edges or shrubby second growth.
Sao Tome Thrush
Turdus olivaceofuscus
A large brown thrush with a yellow-tipped dark bill and scaly underparts. The juvenile is flecked buffy above. The only thrush on São Tomé, where it is a common resident in any environment with trees. Song is a musical, rich, varied whistled medley, “wee-eet wheeeoo, cheee chirrit,” that rolls up and down and is mostly given at dawn and dusk.
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