Yellow-browed Tyrant

The yellow-browed tyrant is 15 to 16.5 cm (5.9 to 6.5 in) long and weighs about 20 g (0.71 oz). Adult males have a mostly dark grayish olive face with a bold bright yellow supercilium. Their upperparts are dark olive. Their wings are dusky black with grayish white edges on the flight feathers and grayish white tips on the coverts that show as two wing bars. Their tail is dusky with white outer webs on the outer feathers. Their underparts are bright yellow with an olive wash on the sides of the breast. Adult females are overall paler than males, especially their supercilium and throat. Their throat and breast have olive mottling. Both sexes have a dark iris, a short, narrow, black bill, and blackish legs and feet. Juveniles resemble adult females with olive spots on the breast.

The yellow-browed tyrant has a disjunct distribution. One population is found across north-central Venezuela and very slightly into eastern Colombia. Its other, much larger, range extends from far southeastern Peru across northern Bolivia and central Brazil to the Atlantic (though stopping short of the far east) and south through southern Brazil, eastern Bolivia, Paraguay, Uruguay, and northern Argentina to northern Buenos Aires Province. It inhabits the edges of forest, brushy fields, pastures with some trees, gallery forest, and treed areas around lakes and marshes. In elevation it ranges from sea level to 2,000 m (6,600 ft) in Brazil. It reaches 200 m (700 ft) in Colombia, occasionally reaches 1,000 m (3,300 ft) in Peru, and in Venezuela occurs up to 500 m (1,600 ft) north of the Orinoco River and only 150 m (500 ft) south of it. It reaches 2,800 m (9,200 ft) in Bolivia.

The yellow-browned tyrant feeds on insects, though details are lacking. It mostly forages singly and less often in pairs. It typically perches upright on an exposed branch. It takes prey mostly by gleaning from vegetation and branches (sometimes hover-gleaning) and less often makes short sallies to capture prey in mid-air ("hawking").