In Hong Kong it flies over wetlands and fishponds. In Hunan, China, it occupies caves and uses clicks in their dark interiors.
In Hong Kong records, the upperparts are dark, while the rump and nape are paler.
In Hong Kong, birds are often alone, though they sometimes fly with others over wetlands or fishponds. Their diet is thought to include flies and wasps or other related insects.
In June 2012 at Shenjing Cave, Hunan, China, birds entered rapidly, then slowed and began clicking in dimmer parts of the cave. They flew more slowly in complete darkness.
In the dark parts of that cave, clicks came in pairs. The two clicks followed each other closely, with a longer interval before the next pair.
Shenjing Cave lies at about 1,650 m elevation, with nests found 80–620 m from the entrance. Two horseshoe-bat species also occupied the cave.
Birds seen in Hong Kong have blunt-tipped wings and a slightly notched tail when closed. Dark underwing coverts contrast with paler flight feathers.
An extinction-risk assessment has not been added yet.