Olivaceous Elaenia

The olivaceous elaenia is 14 to 16 cm (5.5 to 6.3 in) long and weighs 16 to 20 g (0.56 to 0.71 oz). It is a small elaenia without a crest. The sexes have the same plumage. Adults have a dull olive crown with minimal or no white in the middle. They have a white eyering. Their upperparts are dull olive. Their wings are dusky with yellowish or white tips on the coverts that show as two wing bars. Their flight feathers have narrow whitish edges. Their tail is dusky. Their throat is dull gray, their breast olive in a vest-like pattern, their belly white, and their flanks and undertail coverts whitish with a yellow wash. Both sexes have a brown iris, a black bill with a dusky pinkish base to the mandible, and black legs and feet.

The olivaceous elaenia is found from southern Goiás and southern Bahia in eastern Brazil south through eastern Paraguay and into eastern Uruguay and northern Argentina's Formosa, Chaco, and Misiones provinces. Its first record in Uruguay did not come until 2000. The olivaceous elaenia inhabits interior, edges, and clearings of humid tropical forest and also gallery forest, secondary forest, and more open woodlands. In elevation it ranges from sea level to 2,000 m (6,600 ft).

The olivaceous elaenia feeds on insects and small fruits. It captures prey and plucks fruit by gleaning while perched and also captures flying insects on the wing.