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

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Migratory. On breeding grounds, flocks form from mid-Jun onwards; present in inland wintering areas chiefly from early Nov to mid-Mar; main wintering area is Central Valley of California; arrives in flocks on breeding grounds in Colorado by late Mar to Apr, probably after non-stop flight from wintering areas; migratory routes unknown.   (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).