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
Yellow-green Vireo
Vireo flavoviridis
The adult yellow-green vireo is 14–14.7 cm in length and weighs 18.5 g. It has olive-green upperparts and a dusky-edged gray crown. There is a dark line from the bill to the red-brown eyes, and a white supercilium. The underparts are white with yellow breast sides and flanks. Young birds are duller with brown eyes, a brown tint to the back, and less yellow on the underparts. The adult yellow-green vireo differs from the red-eyed vireo in its much yellower underparts, lack of a black border to the duller gray crown, yellower upperparts and different eye color.
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: Mangrove Vireo and Yellow-green Vireo.