Any of various small insectivorous American birds chiefly olive-grey in color
Vireo are a genus of small passerine birds restricted to the New World. They typically have dull greenish plumage (hence the name, from Latin virere, "to be green"), but some are brown or gray on the back and some have bright yellow underparts. ...
Any of several small insectivorous passerine birds, of the genus Vireo, that have grey-green plumage