 Some populations are migratory.This swiftlet was formerly placed in the genus "Collocalia".Two of its five subspecies are frequently given full species status, "A. b. rogersi" as the Indochinese swiftlet, "Aerodramus rogersi", and the isolated Javan form "A. b. vulcanorum" as the Volcano swiftlet, "Aerodramus vulcanorum".