Small flycatcher found in humid forest in lowlands and lower mountain slopes. Male is gray with paler underparts and dark wings with white wingbars. Female looks quite different with olive upperparts and yellowish underparts. She is very similar to Forest Elaenia, but has a paler and cleaner (not mottled) breast. Gray-headed Elaenia is also very similar to Amazonian Elaenia, but note its more southerly range. In areas where their ranges meet, identification may have to be confirmed by voice, though Gray-headed Elaenia usually shows a contrasting pale white or yellow eye. Typical song is a rapid, slightly descending trill, often preceded by one or more clear whistles. Usually stays high in the forest, often in the canopy.