Bolivian Tyrannulet

The Bolivian tyrannulet (Zimmerius bolivianus) is a species of bird in the family Tyrannidae, the tyrant flycatchers. It is found in Bolivia and Peru. == Taxonomy and systematics == During much of the twentieth century the Bolivian tyrannulet and several other tyrannulets were placed in genus Tyranniscus but a study published in 1977 erected the present genus Zimmerius for them. The Bolivian tyrannulet is monotypic. == Description == The Bolivian tyrannulet is 10 to 12 cm (3.9 to 4.7 in) long and weighs 10 to 11.6 g (0.35 to 0.41 oz). The sexes have the same plumage; females are slightly smaller than males. Adults have a dark olive crown, face, and upperparts. Their wings are mostly dark dusky; the coverts and flight feathers have thin bright yellow-green edges. Their tail is dusky olive. Their throat is whitish, their breast grayish olive to yellowish olive, and their belly and undertail coverts pale yellow. Adults have a creamy white iris, a small rounded black bill whose mandible can be deep reddish, purple, or gray, and black legs and feet. Juveniles are like adults except for a reddish to reddish brown iris. == Distribution and habitat == The Bolivian tyrannulet is found on…