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Vireonidae (vireos; class Aves, order Passeriformes) A family of small, brown, green, grey, and yellow birds, many of which have pale supercilia and wing bars. (In the 25 Vireo species the eyes are often white or red.) Their bills are medium to long, stout, and slightly hooked. They have long and pointed to short and rounded wings. They are arboreal, inhabit forests, feed on insects and fruit, and nest in trees and bushes. There are four genera, with about 45 species, many migratory, found in N., Central, and S. America. Two groups, included here, are often regarded as separate families: Cyclarhidae (pepper-shrikes) and Vireolaniidae (shrike-vireos).