Range and Territorial Behavior
Most species are found in Central America and northern South America. Thirteen species occur farther north, in the United States and Canada; of these, all but Hutton's Vireo are migratory. Vireos seldom fly long distances except in migration.
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.
Read more about this topic: Vireo (genus)
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