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Range DescriptionOceanodroma matsudairae is only known to breed on the Volcano Islands (=Kazan Retto), southern Japan. It breeds at least on Minami-iwo-jima, and perhaps formerly on Kita-iwo-jima (Chiba et al. 2007). It has also been recorded around the Ogasawara Islands and is assumed by some to breed there (Brazil 1991, 2009), but this requires confirmation. After the breeding season, it is thought to move south across the equator, perhaps to the Timor Sea off north-west Australia, and then west into the Indian Ocean, where it winters mostly in the equatorial belt around the Seychelles and west to Somalia and Kenya. Some birds may winter off north-east New Guinea. No quantitative data are available on its population, although it is reported to be locally common in its breeding range, and its abundance in the Indian Ocean has led to the suggestion that the global population numbers a minimum of 20,000 individuals (Brooke 2004).