Black-billed Shrike-Tyrant
Agriornis montanus
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?".
ID text from Wikipedia, CC BY-SA 4.0
Lesser Shrike-Tyrant
Agriornis murinus
The lesser shrike-tyrant is 16 to 18.5 cm (6.3 to 7.3 in) long. Adult males have a gray-brown crown, mottled blackish and white lores, and a whitish or buffy supercilium and eye-ring. Their upperparts are gray-brown. Their wings are mostly dusky with whitish tips on the coverts and whitish edges on the inner flight feathers. Their tail is mostly dusky with pale grayish to white outer webs on the outermost pair pair of feathers. Their throat is white with thin black streaks, their breast very pale grayish brown, their flanks pale grayish brown with a buff tinge, and their belly creamy whitish. Voice: As of May 2025 xeno-canto had a single recording of a lesser shrike-tyrant call; the Cornell Lab's Macaulay Library had it and 11 others. The species is usually silent but makes "an occasional phooeeay descending" call.
ID text from Wikipedia, CC BY-SA 4.0
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Black-billed Shrike-Tyrant and Lesser Shrike-Tyrant.