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Range DescriptionThe species is currently only known from individuals found in burrows on Midway Island in the north-western Hawaiian chain, USA, and in the Bonin Islands (Ogasawara Islands), Japan. The species was described from an individual collected in 1963 on Midway Island, with another individual probably of this species observed on Midway in 1991-1992, but is considered unlikely to be regularly breeding in the Hawaiian chain as the seabird colonies have been studied in detail (Pyle et al. 2011). Subsequent analysis of specimens from the Bonin Islands suggests that its main breeding range is within that group, although much exploration is still to be done (Kawakami et al. 2012). In February 2015, 10 birds and at least one nest were discovered on Higashijima in the Bonin Islands (Forestry and Forest Products Research Institute 2015). Prior to 2015, five of the six individuals recorded on the Bonin Islands had been corpses, three of which had been predated by Black Rats (Rattus rattus) (Fjelds, 2013). The at-sea distribution is effectively unknown, although at a minimum it occurs in the tropical or subtropical waters of the central western Pacific Ocean between the north-western Hawaiian chain and the Bonin Islands. Its apparent rarity suggests that the population is extremely small.