Plume-toed Swiftlet
Collocalia affinis
The iridescent blue back is the best way to distinguish this species from other swiftlets within its range, but this feature is typically only visible when the bird is flying low (often over water) or on the nest. Relatively well-demarcated white belly and dark rump also serve to distinguish this species from Aerodramus swiftlets. Common and well-adapted to human habitation, nesting socially in both caves and manmade structures. Flies in flocks over forests, fields, and water bodies. Gives sharp grating twitters at the nest, but generally quiet.
识别特征
The plume-toed swiftlet is 9–10 cm (3.5–3.9 in) in length with a square tail. The back and upper surface of the wings are uniformly dark greenish-blue with a moderate gloss. The throat and upper breast are dark grey merging into large greyish chevrons over the lower breast and flanks, usually becoming white over the belly. There is a tuft of small feathers on the hallux, the rear facing toe. This species lacks a pale contrasting rump and has no white spots on the inner webs of the tail feathers.
分类信息
The plume-toed swiftlet was described by the English ornithologist Robert Cecil Beavan in 1867 and given current binomial name Collocalia affinis. The type locality is Port Blair in the Andaman Islands. The specific epithet affinis is Latin for "related" or "applied". The plume-toed swiftlet was previously treated as a subspecies of the glossy swiftlet but was promoted to species status based on the results of a detailed analysis of the swiftlets in the genus Collocalia published in 2017.<p>There are five subspecies:
- 学名
- Collocalia affinis
- 命名信息
- Beavan, 1867
- 目
- Apodiformes
- 科
- Apodidae
- 属
- Collocalia
照片
鸟叫声
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A handsome long-tailed inhabitant of the Western Ghats. Black face and white underparts set this species apart from Rufous Treepie. White-bellied is typically found well away from human habitation in humid hill forests, where it inhabits both primary and secondary patches. Forages at upper and middle levels of forest, often with other species, particularly Greater Racket-tailed Drongos. Noisy, giving hooting, chattering, and grating calls.
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