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
Yucatan Vireo
Vireo magister
The Yucatan vireo is about 15 cm (5.9 in) long and weighs about 13.5 to 25 g (0.48 to 0.88 oz). The sexes have the same plumage. Adults of the nominate subspecies V. m. magister have a pale brownish white supercilium and brownish gray lores; the latter color extends to behind the eye. Their crown, nape, and upperparts are dark gray-brown with an olive tinge on the back. Their primaries and secondaries are blackish gray with thin paler olive edges on the outer webs. Their tail is dark brownish gray. Voice: On Grand Cayman the Yucatan vireo sings a "two-note whistle whoi whu and 3-syllable sweet, brid-get". In Belize it sings "a rich warble, evenly paced...cheer up sweet or cheer up why not sweet" A variation there is "beer-here alright!-wheo". Its calls include "a soft, dry shi-tchi-chi-chi chatter, a low, frequently repeated bik-bik, and a wik like that of a woodpecker".
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 Yucatan Vireo.