Species fact sheet by Global Register of Migratory Species - www.groms.de

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Distribution and movements outside breeding season poorly known. Returns to colonies Apr to early May, with reproduction complete by mid-Aug, and most birds gone by early Sept. Most birds probably remain near-shore close to breeding areas (e.g. Aleutians), others possibly undergo local movements to adjacent seas (e.g. some Kuril birds to S Japan). Often concentrated in large flocks in winter, presumably at food-rich locations, particularly in E Aleutians.   (del Hoyo J, Elliott A, Sargatal J (eds), 1996)

• digitised by GROMS, after del Hoyo J A Elliott; J Sargatal (eds) (1996) - www.hbw.com,
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