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

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Migratory. Southward migration through North America in Jul-Oct; moves down Pacific cost, though many birds cross interior and along Atlantic coast up to New England; few birds follow W Pacific route and occur in Japan on passage. Juveniles migrate later than adults; females leave breeding area before males. Northward migration in Apr-May; more westerly than autumn route, mainly W of Mississippi and staging in Cheyenne Bottoms (Kansas). Some non-breeders spend summer in USA and Mexico. Regularly sighted in Britain and Ireland, mainly juveniles.   (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,
• Copyright: GROMS/BfN - www.groms.de
  
  (A digitised version of this map is published in GIS shape format on the GROMS CD).