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

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Winters mostly offshore, sometimes near-shore and coastal, usually with in breeding range. S populations somewhat sedentary, often remaining in coastal and offshore waters adjacent to colony; N birds (Alaska) mostly migratory, moving S to at least S British Columbia. N and inshore movements from wintering areas begin as early as Feb-Mar, most birds reaching colonies in late Mar and Apr.   (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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