Gray-rumped Swift
Chaetura cinereiventris
Small dark swift; look for the large gray rump patch. Very similar to other swifts like Costa Rican (no range overlap), Vaux’s, and Band-rumped. A good view of the rump is helpful, but caution is always warranted with swift identification. Usually seen in flocks, sometimes quite large, feeding over habitats such as forests, clearings, open fields, and lakes.
识别特征
The grey-rumped swift is about 10.5 cm (4.1 in) long and weighs about 17 g (0.60 oz). It has a protruding head, a short square tail, and wings that bulge in the middle and somewhat hook at the end. The sexes are alike. Adults of the nominate subspecies have mostly glossy black upperparts with a wide gray rump and uppertail coverts. Their underparts are a lighter gray than the rump, though darker on the undertail coverts. Juveniles are essentially the same as adults with the addition of pale fringes to many of the wing feathers.<p>Subspecies C. c. phaeopygos differs from the nominate only by having pale undertail coverts. C. c. lawrencei has slightly darker underparts than the nominate and black undertail coverts that contrast with the belly. C. c. schistacea has darker upperparts than the nominate, with a steely blue gloss, and also deep gray underparts. C. c. guianensis is almost identical to the nominate. C. c. occidentalis and C. c. sclateri have the darkest rumps of all the subspecies and blackish gray bellies.
分类信息
The grey-rumped swift has these seven subspecies:<p>The grey-rumped swift, pale-rumped swift (C. egregia), band-rumped swift (C. spinicaudus), and Lesser Antillean swift (C. martinica) were at one time placed in genus Acanthylis. Some authors have suggested that the grey-rumped and pale-rumped swifts are conspecific. Others have suggested that all of the grey-rumped subspecies except the nominate C. c. cinereiventris belong to another species under the binomial C. sclateri.
- 学名
- Chaetura cinereiventris
- 命名信息
- Sclater, PL, 1862
- 目
- Apodiformes
- 科
- Apodidae
- 属
- Chaetura
分布与栖息地
The subspecies of grey-rumped swift are found thus:<p>The grey-rumped swift inhabits a variety of landscapes including lowland tropical evergreen forest, montane evergreen forest, seasonally flooded tropical evergreen forest, and secondary forest. In elevation it ranges from sea level to 1,800 m (5,900 ft).
- 迁徙
- Resident species
行为
Migration pattern: Resident species.
保护状况
Population trend: declining.
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
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Gregarious long-tailed little bird. Restricted to southwestern China and adjacent northern Myanmar, where it inhabits grassy and scrubby areas, as well as bamboo stands and secondary growth, in mountains and foothills. Note the warm reddish-brown head, pale eye, darker brown wings and tail, and streaked white throat. Similar to Brown-winged Parrotbill (with which it was formerly considered one species), but note paler eyes and more contrastingly streaked breast. Moves about noisily through dense vegetation, twittering and chattering constantly.
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