Unlike some vireos, this one does not have wing bands.
It’s a great bird to learn by ear, because its fast, rollicking song is its most distinctive feature. The warbling vireo's song is a cheerful warble, similar to that of the painted bunting. Otherwise, Warbling Vireos are fairly plain birds with gray-olive upperparts and white underparts washed with faint yellow. The rich song of the Warbling Vireo is a common sound in many parts of central and northern North America during summer. Warbling Vireo Songtext von Ohio Division of Wildlife mit Lyrics, deutscher Übersetzung, Musik-Videos und Liedtexten kostenlos auf Songtexte.com The eastern warbling vireo, V. gilvus, breeds from central Alberta and northern Montana east and south through most of the United States and parts of southern Canada, outside the range of the previous group. It winters south of the Isthmus of Tehuantepec from south-central Chiapas to Nicaragua. Western Warbling Vireo songs differ from that of eastern mostly in terms of pitch. Otherwise, Warbling Vireos are fairly plain birds with gray-olive upperparts and white underparts washed with faint yellow. Warbling vireo is a small North American song bird, about 5 1/2 inches, somewhat like a wood warbler. They have a dull greenish back, olive-gray on the head, with a light eyebrow stripe that arches above a dark eye, and they are whitish below. Western birds have yellow below and on the sides.

The rich song of the Warbling Vireo is a common sound in many parts of central and northern North America during summer. Most western songs tend to have more high pitched notes, and these are placed more evenly throughout the song, breaking up the rhythm so that the whole strophe sounds less sing-songy than the song of Eastern. It’s a great bird to learn by ear, because its fast, rollicking song is its most distinctive feature.