The more distinctive features on this gray and greenish vireo are the bright eye rings and lores, together called "spectacles."

This bird is often difficult to see as it forages among the foliage; identification is usually based on hearing its distinctive song. Widespread in migration, when its habitat includes city parks and heavily wooded neighborhoods.

The Cassin's vireo is an uncommon to rarely common summer resident in forests and woodlands, except along the immediate coast. it is an uncommon transient throughout the state.

Hear the song of the Cassin's vireo

Photo by Trish Gussler, Flickr