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

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Largely resident; but some migratory movements; and also post-breeding dispersal to lower elevations. Leaves British Columbia in early Sept, some not until mid-Oct; E race nataliae more migratory than nominate, moves S to N Mexico, some to as far as Jalisco and Michoacān, in flocks up to c. 12 individuals; females probably migrate farther S than males. Return passage from Mar or earlier; arrival on breeding grounds mid-Mar to Apr in Oregon, mid-Apr in British Columbia, from early Apr in Colorado; males earlier than females. Casual records E of range, E to Minnesota, Illinois, Louisiana, mostly in spring.   (del Hoyo J, Elliott A, Sargatal J (eds), 2002)

• digitised by GROMS, after del Hoyo J A Elliott; J Sargatal (eds) (2002) - 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).