Great Shrike-Tyrant
Agriornis lividus
The great shrike-tyrant is the largest species of tyrant flycatcher, weighing an average of about 99 g (3.5 oz). It is 26 to 28 cm (10 to 11 in) long. The sexes have the same plumage. Adults of the nominate subspecies have a mostly grayish brown head with some whitish on the lores and a cinnamon tinge on the ear coverts. Their upperparts are grayish brown. Their wings are mostly a duskier grayish brown with pale brown edges on the flight feathers. Their tail is mostly black with buffy white tips and edges of the outer webs of the outer feathers. Their throat is white with heavy black streaks. Voice: The great shrike-tyrant is usually quiet. It does make "t-eek or t-eek-ek" calls.
ID text from Wikipedia, CC BY-SA 4.0
Grey-bellied Shrike-Tyrant
Agriornis micropterus
The grey-bellied shrike-tyrant is 23 to 24.5 cm (9.1 to 9.6 in) long. Adult males of the nominate subspecies have a gray-brown crown, a whitish supercilium, rufous-tinged ear coverts, and black and white streaked cheeks. Their upperparts are gray-brown. Their wings are mostly gray-brown with whitish edges on the secondaries and pale grayish coverts. Their tail is mostly black with narrow white edges on the outer webs of the outer feathers. Voice: The grey-bellied shrike-tyrant is mostly silent. Males chasing another give "high-pitched petulant calls". In the breeding season they make a "high-pitched whistle".
ID text from Wikipedia, CC BY-SA 4.0
Where you might meet both
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Play today's Daily BirdPhotos and recordings are credited to their authors under the licence shown. Full profiles: Great Shrike-Tyrant and Grey-bellied Shrike-Tyrant.