Philadelphia Vireo Identification, All About Birds, Cornell Lab of Ornithology

Adult

Somewhat stocky songbird with a thick, hooked bill. Adults in fresh plumage are bright yellow below with a yellow throat. The dark gray crown contrasts with the white eyebrow, though this can be indistinct on some birds.

Adult

Small and stocky songbird. Rather plain and unmarked overall with a yellowish belly, gray crown, and grayish brown back. Note unmarked wings. Some individuals are brighter than others.

Adult

Song is a steady series of roughly 3-note phrases that end on an upswing or downswing, as if the bird is asking and answering a question, over and over. It is similar to the songs of several other vireo species, including Red-eyed and Blue-headed.

Adult

Small songbird. Pale yellow below with a gray crown and white eyebrow. Easily confused with Warbling and Red-eyed Vireos.

Adult

Often perches horizontally. Upperparts are brownish gray with unmarked wings. Underparts are washed in pale yellow; some individuals are brighter. Note white eyebrow and dark eye.