wingbars and spectacles; tinges of yellow (California, USA; 2007-04-22)

Cassin's Vireo
Vireo cassinii

Native Range: North America

Notes: very similar to Plumbeous Vireo bu slightly less grayish overall and with more olive tinges especially on back; part of the broader "blue-headed complex" of vireo species.

similar to Hutton's Vireo and Plumbeous Vireo (California, USA; 2007-04-15)

grayish head contrasts with spectacles (California, USA; 2007-04-27)