*Ptyonoprogne concolor*, commonly known as the dusky crag martin, is a small passerine bird belonging to the swallow family, found in parts of South Asia, including India, Pakistan, and Nepal. This bird is known for its drab but well-camouflaged plumage, which helps it blend into the rocky cliffs and urban structures where it often resides. It has a uniform brownish-grey color on its body, with slightly darker wings and tail. The tail is short and square with faint white spots on the outer feathers, which are noticeable in flight.

Measuring around 13 to 15 cm (5 to 6 inches) in length, the dusky crag martin has a slender, streamlined body and long, pointed wings that give it an agile and graceful flight. Its small beak and wide gape make it adept at catching insects mid-flight, which forms the bulk of its diet. These birds are often seen flying in loose flocks, gliding and swooping around cliffs or human structures.

The dusky crag martin builds nests out of mud, creating half-cup-shaped structures attached to cliffs or under bridges and buildings. They are highly adaptable and thrive in both natural rocky environments and urban areas. Their soft, twittering calls are often heard as they fly in search of food.