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

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Migratory; almost entire population of USA and Canada winters down Pacific coast. Migration starts in Sept, with movements towards saltwater locations in W; gatherings of several thousand not uncommon at staging posts. Migration nocturnal over land, but partly diurnal along coast. Vagrant to Aleutian Is and Atlantic and Gulf coasts, as far as Tampa Bay, Florida. Mexican populations presumably fairly sedentary, with some local movements between different habitats, depending on season.   (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).