Grey Vireo

The gray vireo is about 13 to 15 cm (5.1 to 5.9 in) long and weighs 11.5 to 13.5 g (0.41 to 0.48 oz). The sexes have the same plumage. Adults have a mostly gray crown and face with white lores and a thin white eye-ring. Their upperparts are gray that gains a greenish cast late in the year. Their wings are mostly dark gray to blackish with white tips on the greater coverts that form a wing bar. Their tail is gray with white edges on the outer webs of the outer feathers. Their chin, throat, and upper breast are a paler gray than their upperparts; their belly and undertail coverts are white. Voice: Male gray vireos sing a "che wi, chee wi, choo or che weet, chee, che chra weet", with much variation by and among individuals. They also sing a longer song of up to nine syllables. Both sexes make a slightly descending trill, a "buzzy eh-eh-eh-eh-eh scolding call, a "chickadee-like zu-zu-zu-zu" and other calls. Birds sing year-round but at a higher rate during the breeding season.