Yungas Tyrannulet

The Yungas tyrannulet is 10 to 11.5 cm (3.9 to 4.5 in) long. The sexes have the same plumage. Adults have a dull olive-gray crown and nape with a slightly mottled appearance. Their lores, supercilium, partial eyering, and lower face are whitish with a dark stripe through their eye. Their upperparts are yellow-olive that becomes paler and more yellowish on their rump and uppertail coverts. Their flight feathers are fuscous to dusky brown with pale yellowish to creamy edges. Their wing coverts are dusky brown with creamy to slightly yellowish to buffy tips and edges that show as two bars on the closed wing. Their tail is dusky brown with yellowish outer edges to the feathers. Their chin and upper throat are whitish with a faint yellow tinge on the latter. Their lower throat, breast, and belly feathers have grayish bases and yellowish tips. The sides of their breast are slightly olivaceous and their undertail coverts yellow. They have a deep brown iris, a black bill with a pinkish base to the mandible, and black legs and feet with yellow soles.

The Yungas tyrannulet is found on the east side of the Andes from extreme southeastern Puno Department in Peru southeast into La Paz, southwestern Beni, and western Cochabamba departments in northwestern Bolivia. It takes its English name from the Yungas bioregion that encompasses its range. It inhabits humid and semi-humid forest in the foothills and lower montane zone where it favors areas with an irregular canopy. It also occurs in shade coffee plantations interspersed with small patches of forest. In elevation it ranges between 700 and 1,200 m (2,300 and 3,900 ft).

The Yungas tyrannulet forages in the forest canopy, usually in pairs, and usually by catching flying insects with short sallies from a perch.