Himalayan Swiftlet
Aerodramus brevirostris
Gray-brown swiftlet with a pale gray rump and a squared-off tail. The westernmost ranging species in the genus and the only member throughout much of its range. Smaller than most other swifts in range except for House Swift, which is black overall with a sharp white rump and throat. Tends to travel in small to medium-sized flocks, often swooping low over bodies of water. Builds dark bowl-shaped nests in closely-clustered colonies under rocky overhangs, in caves, and in old buildings. Gives clicking calls and twitters, especially when near colonies.
识别特征
This 13–14 cm long swiftlet has swept-back wings that resemble a crescent or a boomerang. The body is slender, and the tail is forked. It is, in many respects, a typical swift, having narrow wings for fast flight, and a wide gape and small beak surrounded by bristles for catching insects in flight. Its legs are very short, preventing the bird from perching, but allowing it to cling to vertical surfaces.<p>It is mainly grey-brown above and paler brown below. It has a pale grey rump and a pale patch above and behind the bill. The sexes are similar, but the juvenile has a less distinct rump.<p>There are five subspecies, differing mainly in the rump tone. <p>Over much of its range, this is the only swift, but in the south of its breeding area and much of its wintering range it can be very difficult to distinguish this species from other Collocalia swiftlets.
分类信息
- 学名
- Aerodramus brevirostris
- 命名信息
- (Horsfield, 1840)
- 目
- Apodiformes
- 科
- Apodidae
- 属
- Aerodramus
分布与栖息地
- 迁徙
- Complete migrants
行为
This swiftlet is a highland species, with a preference for feeding open areas in forests, such as river valleys. A. b. brevirostris breeds up 4,500 m in Nepal and 2200m in central Bhutan, and the forms A. b. rogersi and A. b. inniminata occur up to 2200 m in Thailand.<p>The tiny cup nest is constructed by the male swift from thick saliva and some moss, and is attached to a vertical rock wall in a cave. Nests of this colonial swift may be touching. The clutch is two white eggs. This swiftlet is monogamous and both partners take part in caring for the nestlings.<p>The Himalayan swiftlet, like all swifts, is an aerial insectivore, leaving the cave during the day to forage, and returning to its roost at night. In the evening or bad weather, flocks may descend from the hills to feed over cultivated land. This gregarious species forms flocks typically of about 50 birds, but up to 300 have been recorded. Its flight is mainly gliding due to very long primary feathers and small breast muscles.
保护状况
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
Ruby-cheeked Sunbird
Chalcoparia singalensis
Tiny sunbird with a short sharp bill. Male’s metallic green upperparts, wine-red cheeks, and bright orange throat and chest are unmistakable. Female is less distinctive, but note her size, bill shape, and bright orange throat. Found in forest, forest edge, and gardens from lowlands up into hilly areas, typically foraging actively in upper levels of trees. High thin song variable, but usually incorporates whistles and twitters.
White-throated Caracara
Daptrius albogularis
Uncommon in southern Andes; range does not overlap with Mountain Caracara. Favors open habitats above treeline, but also ranges lower to scavenge at dumps and in farmland with open trees. Often associates with Chimango and Crested Caracaras at the dump outside Ushuaia, Argentina. Sails, soars, and tumbles easily on updrafts. Adult is handsome and strikingly patterned black-and-white with creamy white underparts and a bold white tail tip. Juvenile is rather similar to smaller Chimango Caracara, but distinguished by black (not pale) bill.
Burmese Myna
Acridotheres burmannicus
Medium-sized starling of forest edge, agricultural fields, and open scrubby or grassy areas. Thin, black bandit’s mask, medium-gray back, grayish-pink chest, dark iris and bicolored orange-and-black bill. Pale gray rump, white tail tip and flashing white wing patches are most prominent in flight. Like many other starlings, typically encountered in pairs and flocks. Distinguished from Red-billed and Chestnut-tailed Starlings by its mask. Gives loud grating and chattering calls.
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