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Sexes similar, female slightly duller
 Similar Species
Blue-headed Vireo has brighter yellow flanks and more contrast between the head and back.
Plumbeous Vireo is duller with little contrast between the head and the back and lacks yellow on the flanks.
Breeds from British Columbia and southwestern Alberta through central Idaho, across to coastal Washington and Oregon, south to southern California and in Baja California, Mexico. Recent results suggest that at least part of the US population after having bred in early parts of summer migrates to north-western Mexico where a second round of breeding takes place.
Two subspecies are recognized:
The diet includes insects.
The nest is a cup made from bark strips and down. The clutch consists of 2 to 5 white, brown spotted eggs.
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