Adults have glossy blue-black upperparts, a white rump and underparts, and a black throat and undertail. The species uses Himalayan valleys, cliffs, and settlements.
Adults have a glossy blue-black head and back, white rump and underparts, a black throat and undertail, and a squared tail. Juveniles are duller.
It catches flying insects and nests colonially with mud nests on cliffs and buildings. One regional study found most breeding records at 1,000–2,500 m, with some higher records.
An extinction-risk assessment has not been added yet.