Grey Vireo
Vireo vicinior
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.
ID text from Wikipedia, CC BY-SA 4.0
Mangrove Vireo
Vireo pallens
The mangrove vireo is 11 to 12 cm (4.3 to 4.7 in) long and weighs about 9 to 13 g (0.32 to 0.46 oz). The sexes have the same plumage. Adults of the nominate subspecies V. p. pallens have a mostly greenish brown crown, face, and nape with a buffy area from above the lores to past the eye. Their upperparts are greenish brown. Their wing coverts are dark gray with yellowish white tips that form two wing bars. Their flight feathers are dark gray; the primaries and secondaries have thin yellowish green edges on the outer webs and the tertials have whitish edges. Voice: The mangrove vireo's vocalizations vary among the subspecies. In Mexico it sings "a series of 3–12 (usually 4–6) twanging, slightly disyllabic notes". In northern Central America different populations sing jear-jear-jear-jear-jear and wei-wei-wei-wei-wei. In Costa Rica the species sings "a scratchy, monotone chi-chi-chi-chi-chi-chi-chi".
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Grey Vireo and Mangrove Vireo.