White-banded Tyrannulet

The white-banded tyrannulet is 12.5 to 13 cm (4.9 to 5.1 in) long and weighs 8 to 11 g (0.28 to 0.39 oz). The sexes have the same plumage. Adults of the nominate subspecies have a medium gray crown. They have a white supercilium, a blackish stripe through the eye, and a faint dusky crescent behind the ear coverts on an otherwise whitish face. Their upperparts are dark brownish olive. Their wings are dark dusky with bright yellow to ochraceous edges on the flight feathers. Their wing coverts have wide pure white tips that show as two bars on the closed wing. Their tail is dusky olive. Voice: What is thought to be the white-banded tyrannulet's song is "a rising, wheezy rhzeee?, sometimes followed by a rich chew-bit or a scratchy, thin, rising-falling chatter".