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

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Migratory. Migrates in broad front over interior North America to S USA, Greater Antilles, Gulf of Mexico and NW South America; E population crosses Atlantic Ocean from NE North America to Lesser Antilles and NE South America, but returns N through S North America or up coast; part of W population migrates down Pacific coast to NW South America. Some fidelity to wintering and staging sites. Adults precede juveniles during S migration, departing respectively from late Jun and mid-Jul, and adult females precede males; arrives N wintering grounds late Jun to Jul, in Suriname mostly Aug but juveniles mid-Aug to Oct; in California most birds disperse S in Nov. Migrates N across USA and Canada in May, up E USA coast Mid-Apr to mid-May, 1-2 weeks earlier on W coast; males arrive on breeding grounds c. 7 days earlier than females. Migrates in flocks of 10’s to 100’s.   (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).