Red-eyed VireoVireo olivaceus
5 1/2 -6 1/2" (14-17 cm). Sparrow-sized. Olive green above, whitish below, with a narrow white eyebrow bordered above with black. Gray crown; red eye (eye dark in immature); no wing bars. Warbling Vireo similar, but lacks gray crown and black border over bold white eyebrow.