Yellow-olive Flatbill

The yellow-olive flatbill is 12.5 to 14 cm (4.9 to 5.5 in) long and weighs 14.5 to 15.2 g (0.51 to 0.54 oz). The sexes have the same plumage. Adults of the nominate subspecies T. s. sulphurescens have a dark olive crown and nape, a thin white band above the lores, a thin white eye-ring, and pale olive ear coverts with a dusky patch at their rear. Their upperparts are olive-green. Their wings are dusky or blackish with yellowish-olive edges on the wing coverts that form two wing bars. Their remiges have yellowish edges. Their tail is brownish to dusky with buffy edges on the feathers. Voice: The yellow-olive flatbill's song varies widely among the subspecies. That of T. s. cinereiceps is a "series of 4 thin insectlike buzzes, zeee-Zeee-Zeee-ZEEEE!" and its call a "shrill, sibilant tssssp". In western Ecuador T. s. aequatorialis sings "a thin and well-enunciated series of quick notes, 'psee-pset-pset-pset' ". In northern Venezuela T. s. exortivus gives a "buzzy bzz...bzzz...