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

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Variable: disperses widely with general N to S movement from N breeding locations; movements in all directions from mid-latitude breeding locations; some sedentary tendency in S, but in general follows food supplies; some movements in response to aestivation, and hence inaccessibility, of ground squirrels; most birds breeding at altitudes above 2500 m move to lower ground in winter. Post-breeding vagrants wander outside breeding range more commonly in mid-continent plains region than elsewhere.   (del Hoyo J, Elliott A, Sargatal J (eds), 1994)

• digitised by GROMS, after del Hoyo J A Elliott; J Sargatal (eds) (1994) - www.hbw.com,
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