Thick-billed Vireo

The thick-billed vireo is 11.5 to 13.4 cm (4.5 to 5.3 in) long and weighs about 11 to 16 g (0.39 to 0.56 oz). The sexes have the same plumage. Adults of the nominate subspecies V. c. crassirostris have a mostly grayish olive to brownish olive crown, face, and nape with blackish lores, a pale yellow stripe above the lores, and a pale to darker yellow eye-ring that sometimes is incomplete. Their upperparts are grayish olive to brownish olive with a more olive-green rump and uppertail coverts. Their wing coverts are dusky grayish brown with wide white tips that form two prominent wing bars. Their flight feathers are dusky grayish brown; the primaries have off-white edges, the secondaries have pale olive edges, and the tertials have white edges. Their tail is dusky grayish brown. Their underparts are pale grayish buffy to light yellowish buff or yellow. The other subspecies of the thick-billed vireo differ very little from the nominate. All subspecies have a dark iris, a dusky horn maxilla, a pale horn mandible, and bluish gray legs and feet.

The subspecies of the thick-billed vireo are found thus:

V. c. crassirostris: the Bahamas V. c. stalagmium: the Turks and Caicos Islands V. c. tortugae: Île de la Tortue off northern Haiti V. c. cubensis: Cayo Coco and Cayo Paredón Grande off northern Cuba V. c. alleni: the Cayman Islands The species has also been recorded several times in Florida. The thick-billed vireo inhabits deciduous woodlands, scrublands, and mangroves.

The thick-billed vireo feeds primarily on arthropods but also includes some fruit in its diet. It forages at all levels of its habitat taking food by gleaning from leaves and branches.