Noronha Vireo

The Noronha vireo is 14 cm (5.5 in) long and weighs 11.5 to 25.1 g (0.41 to 0.89 oz). The sexes have the same plumage. Adults have a buffy supercilium and brownish lores. Their crown, nape, and upperparts are dingy grayish olive that becomes more greenish on the lower back, rump, and tail. Their primaries and secondaries are grayish olive with greenish edges on the outer webs. Their throat and underparts are dull buffy whitish. They have a brownish iris, a brownish horn bill with a paler base to the mandible, and pale bluish gray legs and feet. Juveniles have a rich rusty brown crown and back.

The Noronha vireo is found only on Fernando de Noronha island, which is about 350 km (220 mi) off the coast of northeastern Brazil. It is the only vireo on the island and is found "[in] any habitat". These include forest, shrublands, and gardens. Primary forest has been almost entirely eliminated on the island so secondary forest remains.

The Noronha vireo feeds mainly on a variety of insects and also includes small fruits in its diet. It forages at all levels of its habitat. "In [the] absence of competing passerine species, [it] seems to have developed a wide variety of feeding techniques." These include often hanging upside-down to take prey from the undersides of leaves and flowers and to regularly take insects in mid-air.