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

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Generally migratory from N half of range, but some birds remain even at N part of range. Sedentary elsewhere, though birds at high altitudes may move to lowlands. In autumn, yearlings migrate first, and females precede males in each age category; migration late Aug-early Nov, with peak from mid-Sept to mid-Oct. In spring, males precede females, Mar-May. Migrates commonly to Mexico, but as far as Costa Rica and rarely Colombia.   (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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