Definition of "vireo"

The voices of male vireos are a constant in the spring woodland, providing background music to the longer, prettier songs of tanagers and thrushes. Vireos tend to sing in bursts interrupted by short or long pauses.

1998, Sally Roth, Attracting Birds to Your Backyard, page 257

Uniquely American, the vireos are a group of some 46 foliage-gleaning forest birds with uncertain family connections. Vireo species are about equally divided between North and South America, with one, the Black-whiskered Vireo, largely restricted to the West Indies. Several vireos make long migratory journeys; all are nocturnal migrants.

2007, Jonathan Elphick, The Atlas of Bird Migration: Tracing the Great Journeys of the World's Birds, page 72

This[the white-eyed vireo] is our only vireo that has two white wing bars, yellow spectacles, and yellow sides.

2012, Eloise Potter, Birds of the Carolinas, Easyread Large Edition, page 94

Family VireonidaeVireosThe vireos are slim grayish green birds that stay high up in the trees most of the time.

1950, Ernest Sheldon Booth, Birds of the West, page 282