House Swift

The house swift is a medium-sized swift, 14–16cm long, weighing about 20–35g. It has a dark, slightly forked tail and black plumage, darker than the little swift, apart from a white rump band and white throat patch. It is found in Japan, Nepal and South-east Asia, and has been recorded in northern Australia and India, indicating some movement in winter (Wikipedia, general species account).

It is highly aerial, feeding in the air for much of the time. It nests on cliffs or in urban areas, where it prefers under roof overhangs of buildings or tunnels, and many nest on cliffs on offshore islands near Vietnam. The source does not describe its status in China (Wikipedia, general species account).