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A 15-cm-long bird with a sturdy, slightly hooked bill, blue-gray crown, white eyebrow (bordered above and below with black), dark olive back, darker wings and tail, pale, unstreaked underparts, and a red eye (brown in fall juveniles); immatures and some fall adults are yellow on the flanks and undertail coverts; subspecies FLAVOVIRIDIS, which sometimes occurs in California and Texas, is yellower...