White-bellied swiftlet

Collocalia is a genus of swifts, containing some of the smaller species termed "swiftlets". Formerly a catch-all genus for these, a number of its erstwhile members are now normally (though not by all authors) placed in Aerodramus.

Based on Rheindt et al., the Glossy Swiftlet, Collocalia esculenta, has been split into 8 species:
 * Tenggara Swiftlet, Collocalia sumbawae (sumbawae, sumbae)
 * Christmas Island Swiftlet, Collocalia natalis (monotypic)
 * Plume-toed Swiftlet, Collocalia affinis (affinis, elachyptera, vanderbilti, oberholseri, cyanoptila)
 * Ridgetop Swiftlet, Collocalia isonota (isonota, bagobo)
 * Grey-rumped Swiftlet, Collocalia marginata (septentrionalis, marginata)
 * Drab Swiftlet, Collocalia neglecta (neglecta, perneglecta)
 * Glossy Swiftlet, Collocalia esculenta (all other subspecies)
 * Satin Swiftlet, Collocalia uropygialis (uropygialis, albidior)

Remaining in Collocalia are:
 * Glossy Swiftlet, Collocalia esculenta
 * Grey-rumped Swiftlet, Collocalia (esculenta) marginata
 * Christmas Island Swiftlet, Collocalia (esculenta) natalis
 * Cave Swiftlet, Collocalia linchi
 * Pygmy Swiftlet, Collocalia troglodytes
 * Bornean Swiftlet, Collocalia dodgei

An Early Miocene fossil swiftlet from the famous Riversleigh deposits of Australia was described as Collocalia buday. This as well as a right ulna (MNZ S42799) found at the Manuherikia River in Otago, New Zealand and dating from the Early to Middle Miocene (Awamoan to Lillburnian, 19-16 million years ago) would probably go into Aerodramus too.