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

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Migratory, winters along coasts of North America (Atlantic and Pacific), NW Europe, Black and Caspian Seas and Japan, Yellow and East China seas. At some localities (e.g. Central Europe, Great lakes of North America) also inland. Males to remain much further N than females or immatures   (del Hoyo J, Elliott A, Sargatal J (eds), 1992)

• digitised by GROMS, after del Hoyo J A Elliott; J Sargatal (eds) (1992) - www.hbw.com,
• Copyright: GROMS/BfN - www.groms.de
  
  (A digitised version of this map is published in GIS shape format on the GROMS CD).