no sexual dimorphism; wingbars, spectacles (California, USA; 2011-01-02) |
Plumbeous Vireo
Vireo plumbeus
Native Range: North America and Middle America
Notes:
with respect to field identification, North American vireos generally can be divided into two groups: (a) those without wingbars or spectacles; and (b) those with wingbars and spectacles; this western USA species belongs to the latter group; it is closely related to the western Cassin's Vireo, which in turn is part of the broader "blue-headed group" of vireos all of which show wingbars and eye spectacles.
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