A new species of Collocalia (Aves: Apodidae) is based on six fossils recovered from a Holocene rockshelter deposit on Mangaia, Cook Islands. The coracoid and carpometacarpus of the new species, C. manuoi, are larger and very different qualitatively from those of the extant C. sawtelli on Atiu, Cook Islands, the geographically nearest population of Collocalia. This is the first species of Collocalia to be described from fossils. The Cook Islands become the first Polynesian island group known to have had multiple species of Collocalia.
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