Buff-banded Tyrannulet

The buff-banded tyrannulet (Mecocerculus hellmayri) is a species of bird in subfamily Elaeniinae of family Tyrannidae, the tyrant flycatchers. It is found in Argentina, Bolivia, and Peru. == Taxonomy and systematics == The buff-banded tyrannulet is monotypic. It and the white-tailed tyrannulet (M. poecilocercus) form a superspecies. == Description == The buff-banded tyrannulet is about 11 cm (4.3 in) long and weighs 10 to 11 g (0.35 to 0.39 oz). The sexes have the same plumage. Adults have a medium gray crown. They have a thin white supercilium and a faint blackish stripe through the eye on an otherwise whitish face. Their upperparts are mostly greenish olive with an ochraceous olive rump and uppertail coverts. Their wings are dusky with pale buffy yellow edges on the flight feathers. Their wing coverts have pale buff tips that show as two bars on the closed wing. Their tail is dusky olive. Their throat is grayish white, their breast and sides grayish white with a darker but faint grayish wash, and their belly and undertail coverts yellowish white. Both sexes of have a brown iris, a thin and pointed black bill, and medium gray legs and feet. == Distribution and habitat == The…