Uniform Swiftlet
Aerodramus vanikorensis
A large, long-winged, entirely gray-brown swiftlet with a very shallow tail fork and a gliding flight action. Found over a variety of habitats, often in flocks with other swiftlets. Almost always seen in flight. Widespread, so overlaps with multiple similar swiftlets. Uniform Swiftlet is larger and longer-winged than Glossy, Cave, and Bornean Swiftlets, with a dark belly and a non-fluttering flight action. Uniform Swiftlet lacks the clear pale rump of White-rumped, Seram, Halmahera, Sulawesi, and some Glossy Swiftlets, and is larger than those species. Uniform lacks gloss on upperparts, unlike Mayr’s, Mountain, and Glossy Swiftlets. It is smaller than Bare-legged, Mayr’s, Papuan, Volcano, and Giant Swiftlets. It is most similar to Edible-nest and Black-nest Swiftlets, but Uniform is darker beneath, and lacks the slightly paler rump of Edible-nest; it is best distinguished from those species by its mossy nest.
识别特征
The uniform swiftlet is a gregarious, medium-sized swiftlet with a shallowly forked tail. It is about 13 cm long with a wingspan averaging around 27 cm. It weighs about 11 grams. The colouring is dark grey-brown, darker on the upperparts with paler underparts, especially on chin and throat. It is similar to, and most likely to be confused with, the white-rumped swiftlet or mountain swiftlet.
分类信息
The uniform swift was formally described in 1832 by the French naturalists Jean Quoy and Joseph Gaimard from a specimen collected on the island of Vanikoro in the Solomon Islands. They coined the binomial name Hirundo vanikorensis. This swiftlet is now placed in the genus Aerodramus that was introduced in 1906 by Harry C. Oberholser.<p>Twelve subspecies are recognised:
- 学名
- Aerodramus vanikorensis
- 命名信息
- (Quoy & Gaimard, 1832)
- 目
- Apodiformes
- 科
- Apodidae
- 属
- Aerodramus
分布与栖息地
This species is widespread from the Philippines through Wallacea, New Guinea and Melanesia. It has been recorded as a rare vagrant to Australia, from Cape York Peninsula and islands in Torres Strait.<p>The uniform swiftlet forages over lowland forests and open areas. It roosts in caves and sinkholes, mostly in limestone areas. The caves may be as little as 10 m (33 ft) long but are usually much larger. Sometimes man-made tunnels or structures are used.
- 迁徙
- Resident species
行为
This species feeds on flying insects, especially ants.<p>This species nests colonially in caves where it uses echolocation to navigate. The nest is a shallow cup of mossy material and saliva, usually attached to a vertical surface of a cave wall in the completely dark zone. On Guam, Neckeropsis lepiniana, is used as the nesting material and in Hawaii, a liverwort (Herberta spp.) is used. One or two white eggs form the clutch. The incubation period is at least twelve days and the young may take thirty-five days to fledge.
保护状况
- 种群趋势
- stable
照片
分布
其他鸟类
Chestnut-faced Babbler
Zosterornis whiteheadi
A fairly small bird of montane forest and scrub on Luzon. Medium brown above, with a gray crown, pale yellow underparts, a rufous mask and forehead, and a broken white eye-ring. A gregarious species, often forming large flocks. Somewhat similar to white-eyes, but has an obvious chestnut mask. Song is a forceful, jumbled whistled melody. Also gives noisy chattering calls.
Spotted Redshank
Tringa erythropus
Elegant wader with a long fine bill and long reddish legs (dark on breeding adults). Striking breeding plumage dark overall. Nonbreeding plumage is paler and grayer than smaller and chunkier Common Redshank. In flight often appears dark overall with narrow white oval up middle of back. Breeds in arctic bogs and swamps; migrants occur in varied wetland habitats. Usually seen as singles or small groups, though will sometimes congregate in large flocks, especially on wintering grounds. Feeds mainly by wading in fairly deep water, probing and picking with its bill, at times swimming.
Hadada Ibis
Bostrychia hagedash
A large, bulky, gray-brown ibis with an iridescent green-purple gloss on the wings. It has a bicolored black-and-red bill and a white streak across the cheek under the eye. Pairs and small flocks occur in a variety of habitats including open country, wetland margins, and forest edge; they forages on the ground, digging, probing soft soil, and picking up invertebrates with their long bills. The frequently-heard call is one of the most characteristic sounds of Africa: a loud, raucous, trumpeting “ha-da-da” which gives the bird its name.
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