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Cassin's Vireo Vireo cassinii


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Cassin's Vireo
credit: Terry Gray/CCSA

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Alternate name: Solitary Vireo

Family: Vireonidae, Vireos view all from this family

Description ADULT Has greenish gray back and grayish hood with white "spectacles." Wings are dark with pale (often yellow) wing bars and fringes to inner flight feathers. Throat and underparts are mostly white with yellow-olive flush to flanks. Legs are blue-gray. JUVENILE Similar, but duller.

Dimensions Length: 5-6" (13-15 cm)

Habitat Common summer visitor (mainly May-Aug) to open coniferous forests on mountain slopes. Winters from southern Arizona to Mexico.

Observation Tips Some birds are impossible to identify with certainty.

Range Northwest, Plains, Rocky Mountains, Western Canada, Southwest, California

Voice Song comprises repeated, well-spaced whistling upslurred tchee'Ooee followed by a downslurred tchewee; call is a rasping rrrh.

Discussion Very similar to Hutton's and dull Blue-headeds. Breeding range and seasonal distribution are pointers. Sexes are similar, but males are usually brighter than females.