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

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Migratory. Movement begins late summer and early autumn, when birds gather in numbers around lakes and freshwater and brackish marshes; birds are cold-sensitive and depart with advent of frosts in Sept-Oct. Migrates on broad front, overland and sea; prone to drifting in strong winds and occasionally taken far out to sea. Present Mexico mid-Aug to May, Panama Sep-Apr, Costa Rica Oct-Apr, West Indies and Venezuela Sept-May, and Colombia Oct-May (oversummering recorded). Return noted to S USA from Mar; spreads N in Apr, reaching Canada early May. Main passages Atlantic coast (Maryland) mid-Apr to mid-May, and mid-Aug to late Oct. Accidental EC Alaska, Queen Charlotte Is, S Labrador, Bermuda, Greenland and W Europe.   (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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