Medium-sized, gray-and-white flycatcher of rainforest canopy. Note clean white underparts, contrasting dark head, and (usually) ruffled crown feathers. A rather uncommon resident of tall rainforest; usually found in pairs or small groups, which can be quite noisy and often perch on exposed bare branches. Feeds mainly on insects gleaned in short flights to foliage. May follow mixed-species flocks but often observed away from them. Most easily detected by its varied, strident calls, which include a long, mournful whistle reminiscent of Dusky-capped Flycatcher, and a rapid series of short whistles, the final one lower-pitched and longer. Distinguished from Dusky-capped Flycatcher by white underparts and more varied, excited-sounding vocalizations.