Range and Territorial Behavior
Most species are found in Middle America and northern South America. Thirteen species of true vireos occur farther north, in the United States and Canada; of these all but Hutton's Vireo are migratory. Members of the family seldom fly long distances except in migration (Salaman & Barlow 2003). They inhabit forest environments, with different species preferring forest canopies, undergrowth, or mangrove swamps (Forshaw & Parkes 1991).
The resident species occur in pairs or family groups that maintain territories all year (except Hutton's Vireo, which joins mixed feeding flocks). Most of the migrants defend winter territories against conspecifics. The exceptions are the complex comprising the Red-eyed Vireo, the Yellow-green Vireo, the Black-whiskered Vireo, and the Yucatan Vireo, which winter in small wandering flocks (Salaman & Barlow 2003).
Read more about this topic: Vireo
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