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

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Migratory. Many migrate inland, across North American prairies, Rockies and N Andes, often staging at high altitude lakes. Funnel through Canada W of Hudson Bay, then stopover in prairies of S Canada and N USA, especially Cheyenne Bottoms (Kansas), whereafter non-stop journey to Andes by mid-Aug, bypassing Central America off W coast. Adults depart early Jul, females slightly preceeding males; juveniles migrate later from breeding grounds, from late Jul, in more leisurely fashion, and over broader front, from Pacific states to Atlantic; unlike adults, many juveniles move into SW USA; juveniles reach Patagonia mainly early Oct. N migration largely along same route.   (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).