- May have yellowish flanks or belly in fall and a faint buff wing bar
The Red-eyed Vireo complex (Red-eyed, Black-whiskered, Yellow-green) has an olive-green back color and a contrasting gray crown, a bold white supercilium offset by black stripes above and below, and red eyes as adults. Philadelphia Vireo has dark lores and pale yellow throat and breast. All other vireos have wing bars. Tennessee Warbler has similar, though more olive, plumage, but is smaller and has a thin, pointed bill.