Slaty-backed Chat-Tyrant

The slaty-backed chat-tyrant is 12 to 13 cm (4.7 to 5.1 in) long and weighs 11 to 13 g (0.39 to 0.46 oz). The sexes have the same plumage. Adults have a dark slaty gray head with a white supercilium. Their upperparts and tail are dark slaty gray to blackish. Their wings are slightly browner than the back. Their breast and belly are deep dark chestnut or reddish brown, their flanks dark gray, and their vent and the middle of their lower belly are buffy white. They have a dark brown or blackish iris, a short, thin, black bill, and blackish to dark dusky gray legs and feet. Voice: The slaty-backed chat-tyrant's day song, or perhaps call, is "a high-pitched, sharp, and surprisingly loud dzweeéyeeuw, often tirelessly repeated". Its dawn song is the same vocalization "followed by 3-4 tseét notes". "Despite (or thanks to) its simplicity, perfectly audible above rushing torrents, where this species is usually found."