Atiu Swiftlet (Aerodramus sawtelli) [XC442624]
by id from Tengatangi, Atiu, Cook Islands, New Zealand (flight call)
Atiu Swiftlet (Aerodramus sawtelli) [XC110960]
by JACOB Herv\u00e9 from Anatakitaki Cave, Atiu, Cook Islands, New Zealand (sonar clicking)
Subspecies
Genus often merged into Collocalia. Has been considered to form a superspecies with Polynesian Swiftlet (Aerodramus leucophaeus), or even to be conspecific, but apparently differs in nest habits. May prove to be merely a subspecies of White-rumped Swiftlet (Aerodramus spodiopygius), which is very similar in size and plumage and which occurs not far from Cook Is.