Black-capped Vireo
Vireo atricapilla
The black-capped vireo is a songbird about 12 cm (4.5 inches ) in length. Sexually mature males are olive green above and white below with faint yellow flanks. The crown and upper half of the head is black with a partial white eye ring and lores. The iris is brownish-red and the bill is black. Females are duller in color than males and have a slate-gray crown and underparts washed with greenish yellow. First-year males often have more extensive gray in the cap, similar to adult females.
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-capped Vireo and Mangrove Vireo.