Sharp-tailed Sandpiper
Calidris acuminata
Medium-sized sandpiper with distinct cap. Breeding adults are heavily marked with chevrons and spots on the underparts and have a rich chestnut cap and white eyeing. Nonbreeding adults are duller grayish-brown with a drab brown cap. Juveniles are brightest, with a plain buffy breast, bright cap, and contrasting white eyeline. At all ages, note dull greenish legs and variable paler color at the base of the bill. Similar to Pectoral Sandpiper, but Sharp-tailed is usually brighter (breeding adults and juveniles especially) and lacks a sharp demarcation between streaked breast and white belly. Primarily an Asian species, breeding on tundra in Russia and wintering to Australia and New Zealand. Regular migrant in Alaska; rare to Pacific coast of U.S. and Canada. Found in freshwater marshes and coastal mudflats, sometimes inland. Listen for excited “peep!” calls, often doubled, and other soft twitters.
识别特征
A small-medium wader, the portly sandpiper has a pot belly, flat back and somewhat drawn-out rear end. It has a mottled chestnut-brown upper body with sharp-looking feathers with a dark centre, a chestnut cap on its head and a brown stripe through each eye. Its bill is dark grey to black and straight, and its legs are olive- to yellow-coloured. The underparts are white or paler in colour, with the mottling similar to that on the breast and sides of the belly. The plumage is duller during wintering and more vivid during the breeding season. The juveniles are brighter in colour during wintering than adults, with sharper feathers and brighter chestnut-coloured crowns contrasting with the white mantle stripes and bright, buffy chests.<p>A similar-looking species is the pectoral sandpiper, within whose Asian range the sharp-tailed sandpiper breeds. It differs from that species in its breast pattern, stronger supercilium, and more chestnut-coloured crown. It has some similarities to the long-toed stint, but is much larger.
分类信息
The genus name calidris comes from the Ancient Greek kalidris or skalidris, a term used by Aristotle for some grey-coloured waterside birds. The specific acuminata is from Latin acuminatus, 'sharp, pointed'.<p>It had previously been suggested that the sharp-tailed sandpiper should perhaps be placed into the genus Philomachus – as P. acuminatus – which contains the ruff, however this proposed change has yet to receive widespread acceptance.
- 学名
- Calidris acuminata
- 命名信息
- (Horsfield, 1821)
- 目
- Charadriiformes
- 科
- Scolopacidae
- 属
- Calidris
分布与栖息地
In Siberia the breeding ground is mostly tundra made up of peat-hummock and lichen. On passage between breeding and wintering areas they favor the muddy edges of shallow freshwater or brackish wetlands with grass, emergent or inundated sedges, saltmarsh or other low vegetation. These include swamps, lakes, lagoons, and pools near coasts, waterholes, dams, saltpans and hypersaline salt lakes inland. In Alaska they seem to prefer coastal moist graminoid meadows and riverine intertidally exposed mudbanks. In Australia they are largely found around wetlands, preferring freshwater inland wetlands with grassy edges. Once the ephemeral terrestrial wetlands have dried out, they tend to be seen on coastal mudflats, salt marsh and brackish lagoons and less often on similar wet fields of short grass. Other areas they have been spotted in Australia include around sewage farms, flooded fields, mangroves, rocky shores and beaches.
- 繁殖区
- PAL : low Arctic to subarctic tundra of ne Palearctic: Lena to Kolyma rivers (ne Siberia)
- 非繁殖区
- AU : coastal and inland Wallacea, New Guinea, Australia, Melanesia, New Zealand and Fiji (sw Polynesia); prone to extreme vagrancy to North America and Europe
- 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
其他鸟类
Slaty-backed Gull
Larus schistisagus
Thickset, short-winged, pot-bellied gull. Adult has dark gray back and wings, intense pink legs, and an especially large white “crescent” (white tertial edges) near the wingtips when perched. Breeding adult white-headed; nonbreeding birds have variably heavy brown streaking on the head and upper breast. Takes four years for immatures to progress from mostly brown to fully white and gray adult plumage; intermediate plumages are often mottled and messy. Often looks rather frosty by the first winter; starts to develop a gray back and whitish eye in its second year. Primarily an Asian species, found in coastal regions from Japan and South Korea to Russia. Regularly occurs in western Alaska, but very rare elsewhere in North America.
Eurasian Bullfinch
Pyrrhula pyrrhula
Uncommon to fairly common, but unobtrusive and easily overlooked. Favors mixed woodland and edge, parks, gardens, orchards; also farmland with hedges and wooded patches. Usually found in pairs or small groups, feeding quietly and sluggishly on buds and fruits; does not usually visit feeders. Male handsome and distinctive, with black cap, bright pink cheeks and breast, blue-gray back; female colors muted, but note distinctive black cap, stubby black bill. White rump patch shows mainly in flight. Soft, plaintive whistled notes may draw attention.
Socorro Parakeet
Psittacara brevipes
Bright green bird with long, pointed tail. Bill is dull pink. Endemic to the Socorro Island off the coast of Mexico. Seen in small flocks in wooded areas. Feeds on fruit and seeds. Listen for high-pitched screeching calls.
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