Glossy Swiftlet
Collocalia esculenta
A tiny swift with glossy upperparts (many forms showing a greenish-blue tinge), a white belly, and a bat-like, fluttering flight action. Some forms show a white rump. Occurs over most habitats throughout range, often within flocks that regularly mix with other swiftlet species. Away from nesting colonies, always seen in flight. Smaller and shorter-winged than Uniform, Papuan, Bare-legged, Mayr’s, Mountain, and White-rumped Swiftlets. Further distinguished from those species and from Edible-nest, Sulawesi, Seram, and Halmahera Swiftlets by white belly and flight action.
识别特征
This bird is shiny black-blue above, including its rump; sometimes looks black and hooded. Chest black; belly to flanks white with fine black speckles at margins. Wing tips are rounded; underwing is black. Tail rounded with shallow notch and tiny white panels. It is so similar to the white-rumped swiftlet that both its upperparts and underparts must be seen to distinguish between the two. It is 9 to 11.5 cm (3.5 to 4.5 in) in length. Its voice is a soft twittering.
分类信息
The glossy swiftlet was described by the Swedish naturalist Carl Linnaeus in 1758 in the tenth edition of his Systema Naturae under the binomial name Hirundo esculenta. The type locality is Ambon Island, one of the Maluku Islands of Indonesia. The specific epithet esculenta is from esculentus the Latin word for "edible".<p>There are 17 recognised subspecies:<p>Seven taxa that are now recognised as species were previously considered as subspecies of the glossy swiftlet. They were raised to species status based on a detailed analysis of the swiftlets in the genus Collocalia published in 2017. The promoted taxa are:
- 学名
- Collocalia esculenta
- 命名信息
- (Linnaeus, 1758)
- 目
- Apodiformes
- 科
- Apodidae
- 属
- Collocalia
分布与栖息地
The glossy swiftlet is known from Indonesia, Timor, Brunei, Christmas Island, Philippines, Papua New Guinea, the Solomon Islands, Vanuatu and New Caledonia. It is a vagrant to Australia. It is not a migrant.
- 迁徙
- Resident species
行为
The glossy swiftlet nests inside caves and buildings, creating a nest on a vertical or under a horizontal surface by secreting a sticky gel and attaching a kind of string-like grass to the surface. It is seen flying over forests, streams, rivers and roads catching insects in flight.<p>Glossy swiftlets have been considered as possible foster parents for restoring the population of the endangered edible-nest swiftlet in the Andaman Islands.
保护状况
- 种群趋势
- stable
照片
鸟叫声
其他鸟类
African Harrier-Hawk
Polyboroides typus
A large, grayish, naked-faced hawk with broad wings. The small, bare, yellow (sometimes flushed red) face, white-banded black tail, and underwing pattern distinguish it. The immature is blotchy brown with yellow-green facial skin and barred flight feathers. Harrier-hawks are specialists, foraging on eggs and nestlings, and they have double-jointed knees which allow them to access nest holes and other confined spaces. They are often seen clumsily clambering around on cliffs and trees when foraging. Although similar to chanting-goshawks, African Harrier-Hawk’s long but small angular head, broad wings, and tail pattern are diagnostic.
Westland Petrel
Procellaria westlandica
Rather large, wholly dark petrel. Breeds in New Zealand and ranges across the temperate South Pacific to Chile, where it is uncommon to locally fairly common in the Humboldt Current and fjords. Often found with much commoner, but very similar White-chinned Petrel and is not easily identified unless distinct black bill tip of Westland can be seen (White-chinned has pale bill tip). Slightly smaller Parkinson’s Petrel looks very similar to Westland, but favors warmer tropical and subtropical waters and has a smaller, more rounded head and slightly slimmer bill.
Vietnamese Cutia
Cutia legalleni
A bulky, heavyset bird with a murderous-looking hooked bill. Very similar in appearance to Himalayan Cutia, but ranges do not overlap. Male has blue-gray crown and wing patch, midnight-black mask, orange back and rump, and black-barred white underparts. Female of southern population is much duller, with a dark brown head and streaked brown back. (Northern female has not yet been described.) Inhabits both broadleaved and coniferous hill forest. Moves sluggishly, often in mixed flocks. Song is loud and repetitive, consisting of somewhat twangy whistles and more fluid, warbled notes.
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