A skulking, mostly rufous bird with a gray crown and a white throat bordered by black. Throat pattern and long, rufous tail are distinctive. Occurs only in understory of gallery forest in savanna regions along tributaries of the Rio Branco in northern Brazil and western Guyana. Usually in pairs, which clamber through low vegetation searching for insects. Almost always first detected by voice: a hard, doubled note, often given in alternation by members of a pair, and occasionally extended into a longer series, especially in response to playback. No similar species are likely to occur in same habitat.