夜鹰目

白腰雨燕 Fork-tailed Swift
Apus pacifcus

小型夜鹰
体长 17~18 cm

虹膜 /iris

深褐色 /dark brown

嘴 /bill

黑色 /black

脚 /legs and feet

偏紫色 /purple

目 │ 夜鹰目CAPRIMULGIFORMES 科 │ 雨燕科 Apodidae

野外识别 │ 体型较细长，两翅狭长，通体黑褐色，尾长而尾叉深，腰白色。

居留及分布 │ 夏季繁殖鸟。繁殖于西伯利亚及亚洲东部，经中南半岛迁移至印度尼西亚、巴布亚新几内亚及澳大利亚越冬。南岭分布于第一峰、天井山电视台、炉田等地。

生境及习性 │ 成群活动于开阔地区，常与其他雨燕混合。成群在一起营巢，营巢于岩隙间或山洞内，巢呈杯状。繁殖期 5—7 月。每窝产卵 2~3 枚，卵白色，光滑无斑。雌鸟孵卵。孵化期 20~23 天。雏鸟晚成性，经亲鸟 33 天的喂养，幼鸟即可离巢飞翔。

Field identification │ Larger and more slender-bodied than House Swift and with long sickle-shaped wings and a long, tapering, deeply forked tail. Apart from a narrow white rump patch, a whitish throat and whitish scales on the underbody (visible on close views), the plumage is blackish-brown and darkest on the upperwing and tail.

Distribution & status │ Breeds from Siberia to Japan and in much of China, and winters south to Australia. Two subspecies occur in southeast China: the nominate as a passage migrant and kanoi breeding. In Nanling, it is a very common summer visitor and passage migrant, recorded at Diyifeng,Television Station of Tianjingshan, Lutian.

Habitat & habits │ Fork-tailed Swifts occur in large flocks over a variety of open and forested habitats on migration and over hill forests in the breeding season. They are fast flyers and spend much of their lives in open air-space, where they forage for flying insects. They nest colonially in caves,especially limestone, and on rock faces between May and July in Guangdong.