small islands off Cape Leeuwin, Western Australia.
Sometimes considered conspecific with A. creatopus; the two are probably closely related to A. gravis. Birds from Lord Howe I and New Zealand may merit separation as race hulliana, on grounds of different migratory routes and slight size differences. Monotypic.
Indian and Pacific Oceans, breeding on St Paul I (S Indian Ocean) and SW Australia, with single isolated colony in South Australia; breeds also on Lord Howe I (off E Australia) and on islands off North I and in Cook Strait (New Zealand).
Food and feeding
Status and conservation
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