Golden Vireo
Vireo hypochryseus
The golden vireo is about 12 to 13 cm (4.7 to 5.1 in) long and weighs an average of 12.2 g (0.43 oz). The sexes have the same plumage. Adults have a wide lemon yellow supercilium and streak above the lores with a dark streak through the eye. Their upperparts and tail are yellowish olive-green. Their flight feathers are dark brownish gray with pale yellowish olive edges; by the outer primaries the edges have lightened to pale gray or grayish white. Their underparts are lemon yellow with a pale olive green tinge on the flanks. Voice: The golden vireo's song is "a rapid series of bright notes, the last usually sharply inflected upwards, whee-whee-whee-wheet or jujujujujeet, at times preceded and followed by a sharp chip, tsik, deeu-deeu-deeu-deeu-deeu-deeu tik".
ID text from Wikipedia, CC BY-SA 4.0
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
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: Golden Vireo and Grey Vireo.