Black Phoebe
Sayornis nigricans
A medium-sized, sooty-black flycatcher. Marked geographic variation: most North American birds have dull wings and a clean white belly, while South American birds have bright white edging on wing feathers and much more limited white on the belly. Typically seen singly or in pairs, usually sitting conspicuously on a low perch. Frequently pumps tail up and down. Often near water; especially tied to fast-flowing, rocky streams in South America.
识别特征
The black phoebe is a medium-sized flycatcher, being 16 cm (6.3 in) in length and weighing 15 to 22 g (0.5 to 0.8 oz). It has predominantly black plumage, with white on its belly and undertail coverts. The white forms an inverted "V" in the lower breast. The sexes are identical and plumage does not vary seasonally. Juveniles have browner plumage, cinnamon-brown feather tips on their body, and brown wing-bars. The bird has brown irises and black legs, feet, and beak.<p>The phoebe can be recognized by a characteristic "tail-wagging" motion, in which the tail is lowered and the tail's feathers fanned out. It accomplishes almost all locomotion by flight, which is direct, with steady wing beats. Its song consists of two alternating phrases (tee-hee, tee-ho or sisee, sitsew). The song can be heard from both sexes, but is more commonly sung by males.
分类信息
The phoebes are a genus, Sayornis, of birds in the tyrant flycatcher family. The flycatchers are the largest family of birds on earth, with over 400 known species. The genus name was given by George Robert Gray of the British Museum, and is named after Thomas Say, an American naturalist. The species name, nigricans, is Latin for "blackish", and was given by William John Swainson in 1827.<p>The black phoebe has six subspecies, but these can be divided into two groups which are sometimes considered to be separate species: the nigricans group (black phoebe) and the latirostris group (white-winged phoebe). The first group contains four subspecies, the second group two.
- 学名
- Sayornis nigricans
- 命名信息
- (Swainson, 1827)
- 目
- Passeriformes
- 科
- Tyrannidae
- 属
- Sayornis
分布与栖息地
The black phoebe breeds in the west and southwest United States, Mexico and Central America, and parts of South America. In Oregon it is found in river valleys on the Pacific coast, and in California on the western side of Coast Ranges. It breeds throughout the Colorado River valley and occasionally is found to the north in southern Nevada and southwestern Utah, as well as Arizona and central New Mexico. The black phoebe's breeding range in the United States extends as far southeast as the Lower Rio Grande Valley. In Central America it breeds on Baja California, except for the central part of the peninsula, and on interior mainland Mexico southwest to Panama, excluding El Salvador. In South America it is found in the coastal mountains of Venezuela, through Colombia, Ecuador, and Peru, to western Bolivia and northwestern Argentina.<p>It lives year-round in most of its range and is more sedentary (non-migratory) than either of the other phoebes in its genus (Eastern or Say's), although northern populations may be partially migratory. It is always found near water and is often found at coastal cliffs, river/lake banks, or even park fountains. Habitats must also include a supply of mud for nest building, and the birds' specialized nesting requirements probably cause their somewhat irregular range.
- 迁徙
- Complete migrants
保护状况
- 种群趋势
- rising
照片
分布
鸟叫声
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