Philadelphia Vireo Vireo philadelphicus

Small, short-tailed, most similar to Warbling Vireo, but brighter: look for yellow wash on underparts, brightest on throat and undertail, and dark line through the eye that connects to base of bill. Dull individuals can be very difficult to distinguish from Warbling Vireo, but Warbling usually brightest yellow on flanks, not throat. Similar to Red-eyed Vireo but with shorter bill and yellower below. Breeds in deciduous forests, especially areas with younger trees including birches or aspens. Migrates through a variety of wooded and brushy habitats; winters in Central America. Song nearly identical to Red-eyed Vireo. Feeds on insects; especially caterpillars.