Collocalia sawtelli
The Atiu swiftlet or Sawtell's Swiftlet (Aerodramus sawtelli) is a species of bird in the swift family, endemic to Atiu in the Cook Islands.
This small, dark swift measures 10 cm (3.9 in) long. It is sooty-brown above, slightly lighter below.[2]
Its natural habitats are the island's fernlands and mixed horticultural areas over which it feeds, and in makatea limestone caves within which it nests.[2] The species is known on Atiu as kopeka.
Unlike all other swiftlets, it echolocates only through single clicks, rather than a mix of single- and double clicks.[3]
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