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

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Partially migratory; northernmost and southernmost breeders descend to lower latitudes, to winter generally within sub-tropical zone; populations of more temperate regions chiefly sedentary or with only small-scale dispersive movements. Vagrant to Alaska; records well out-of-range (e.g. Europe) presumably refer to escapes.   (del Hoyo J, Elliott A, Sargatal J (eds), 1992)

• digitised by GROMS, after del Hoyo J A Elliott; J Sargatal (eds) (1992) - 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).