Cassin's Vireo
Vireo cassinii
ORDER: PASSERIFORMES
FAMILY: VIREONIDAE
IUCN Conservation Status: Least Concern
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A common bird of the far western forests, the Cassin's Vireo is conspicuous for its constant singing. Formerly lumped as a "Solitary Vireo" with the Plumbeous and Blue-headed vireos, it is now considered a separate species.