Guatemalan Tyrannulet

The Guatemalan tyrannulet is 10 to 12 cm (3.9 to 4.7 in) long. The sexes have the same plumage. Adults have a grayish crown and a short whitish supercilium. Their upperparts are olive green. Their wings and tail are mostly olive green with yellow edges on the wing coverts, flight feathers, and tail feathers. Their underparts are mostly off-white with faint darker streaks on the breast and sometimes a pale yellow wash on the belly and undertail coverts. Both sexes have a light brown or brownish black iris, a short brownish black bill, and long brownish black legs and feet. Immature birds have dark irides and more green in their crown than adults.

The Guatemalan tyrannulet is found from the southern Mexican state of Chiapas east across Guatemala into southern Belize and south through Guatemala into El Salvador. It inhabits the interior and edges evergreen forest and also more open forest, plantations, and fields with scattered trees and shrubs. It favors areas with mistletoes (Loranthaceae). In elevation it ranges between 500 and 2,500 m (1,600 and 8,200 ft).

The Guatemalan tyrannulet's diet has not been detailed but is known to include mistletoe berries, other fruits, and insects. It forages singly or in pairs, at all levels of the forest but mostly from the forest mid-story to the canopy. It takes food by gleaning while perched and with short sallies.