Black-whiskered Vireo
Vireo altiloquus
The black-whiskered vireo is 15 to 16.5 cm (5.9 to 6.5 in) long. The nominate subspecies V. a. altiloquus weighs an average of 18 g (0.63 oz). The sexes have the same plumage. Adults of the nominate subspecies have a bluish gray forehead and crown with a buff-olive tinge, a buffy whitish supercilium from the bill past the eye, a wide dusky stripe through the eye, and the eponymous black "whisker" on the sides of the throat. Their nape and upperparts are olive-green. Voice: Migratory black-whiskered vireos sing during the breeding season and are silent on the wintering grounds. Nonmigratory populations sing year-round but more frequently during the breeding season. In the West Indies the black-whiskered vireo sings monotonously throughout the day, "hort, melodious 2- to 3-syllable phrases, each different, separated by pauses".
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: Black-whiskered Vireo and Mangrove Vireo.