Blue-and-white Swallow
Pygochelidon cyanoleuca
One of the most common and widespread Neotropical swallows. Small and compact with notched tail. Generally dark above and white below; best field mark is black undertail coverts sharply cut off from white belly. Flocks can be seen in towns and cities, open fields, bodies of water, and over forest. Often perches on telephone wires.
识别特征
The adult blue-and-white swallow averages 11–12 cm (4.3–4.7 in) long and weighs about 10 g (0.35 oz). It has dark blue upperparts and white underparts, and its underwings and the undersurface of its short forked tail are blackish. The juvenile is brown above, buff-tinted below, and has a less forked tail. The call is a buzzing dzzzhreeee.<p>There are three subspecies. The nominate N. c. cyanoleuca occurs from Nicaragua and Trinidad south to northwestern Argentina, Paraguay and Uruguay. The migratory southern race N. c. patagonica is larger, 13.5 cm (5.3 in), has paler underwings, and white basal undertail coverts. N. c. peruviana is restricted to coastal Peru up to 2,500 m (8,200 ft) altitude. It is smaller than patagonica, has less white in the undertail, darker underwings and duskier flanks.
分类信息
The blue-and-white swallow was first formally described as Hirundo cyanoleuca by the French ornithologist Louis Pierre Vieillot in 1817, based on a specimen he believed to be from Paraguay. The scientific name has the same meaning as the English common name.<p>This species was formerly placed in the genus Notiochelidon. It was moved to the resurrected genus Pygochelidon based on a phylogenetic study published in 2005.<p>Three subspecies are recognised:
- 学名
- Pygochelidon cyanoleuca
- 命名信息
- (Vieillot, 1817)
- 目
- Passeriformes
- 科
- Hirundinidae
- 属
- Pygochelidon
分布与栖息地
This is a swallow of open areas including villages and towns, farms, and forest clearings. In Central America, it is a highland bird, but elsewhere in its range it can occur from the lowlands to an altitude of 4,000 m (13,000 ft).
- 迁徙
- Complete migrants
行为
This species is often found in small flocks when not breeding. The blue-and-white swallow subsists primarily on a diet of insects, caught in the air; they have been seen to gather where termites swarm. The flight is typically fluttery, and this swallow frequently perches on wires or branches.<p>The blue-and-white swallow's shallow straw nest is built by both adults in a wide range of natural or man-made cavities include tree holes, rock crevices and bridges. The clutch is up to six white eggs in the south of the range, two or three in the north, which are incubated by both parents for 15 days to hatching. The nestlings are fed by both parents for 26 days to fledging, but return to the nest to sleep with the parents for up to two months. There may be two broods.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Siberian Pipit
Anthus japonicus
Slender and drab songbird of open country. Brownish above with heavy streaking below. Distinguished from similar-looking (unrelated) buntings by thin bill and lanky appearance with long legs. Walks on the ground with jerky motions and frequently bobs tail. Breeds in tundra, while in winter and during migration, found in cultivation, moist grassland, and wetlands. Flocks are often heard as they pass overhead or flush from a barren field; listen for sharp, high-pitched call notes and look for flashing white outer tail feathers.
European Red-rumped Swallow
Cecropis rufula
Brightly-colored swallow with a deeply forked tail, pale orangish rump, black squared-off undertail coverts, an incomplete orange collar, and faint streaking below. Juveniles average paler and lack extensive orangish tones; may resemble house-martins but note deeply forked tail. Typically glides on stiff, flat wings, flying quite languidly with shallow wingbeats. Builds mud nests in mountains, on sea cliffs, and on buildings and other structures. Forages over open areas. Frequently gives a short, sparrow-like “twi’wit.” Very similar to African Red-rumped Swallow, but shows much heavier streaking below.
Northern Red Bishop
Euplectes franciscanus
A very small gregarious species of open habitats including agricultural areas and the edges of marshes; often found in flocks of tens to hundreds. Note the black face and crown, brown wings, and long reddish orange uppertail coverts (concealing black tail) of breeding male. Nonbreeding males and females distinguished from similar Black-winged Bishop by smaller size and bill and told from Yellow-crowned Bishop by buffier coloration and more limited streaking on chest. Song is a rapid jumble of squeaky, twittering, and churring notes. Its calls include a sharp “tsit” and “tzit.”
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