Eurasian Crag Martin

The Eurasian crag martin is a small swallow-family bird about 14cm long, with ash-brown upperparts, paler underparts, a broader body than similar species and a short, square tail with distinctive white patches on most of its feathers. It can be confused with the three other species in its genus but is larger with brighter tail spots and different plumage tone (Wikipedia, general species account).

It breeds in the mountains of southern Europe, north-western Africa and across the Palearctic. Many European birds are resident, but some northern populations and most Asian breeders are migratory. Its nest sticks to the rock under a cliff overhang, increasingly onto a man-made structure, with two to five brown-blotched white eggs. The source does not describe its status in China (Wikipedia, general species account).