Black-billed Shrike-Tyrant

The black-billed shrike-tyrant is 22 to 24 cm (8.7 to 9.4 in) long. The sexes have the same plumage. Adults of the nominate subspecies A. m. montanus have a whitish stripe above the lores, a buffish white broken supercilium, and brown-streaked white cheeks. Their crown and upperparts are dark grayish brown. Their wings are mostly dark grayish brown with whitish tips and edges on the inner flight feathers. Their underwing coverts are cinnamon-buff to buffy white. Their central pair of tail feathers is blackish; the rest are white with dark bases on their inner webs. Voice: The black-billed shrike-tyrant is not highly vocal but sings more frequently at dawn than during the day. Its voice has been described as "a loud, ringing wheee, wheeeu or just sheeeu." Another description calls its song "a loud, musical, whistled, rising-falling WEEYOO" and its call "a rising wee?".