Black-billed Peppershrike
Cyclarhis nigrirostris
Olive coloured overall with grey throat, belly, cheek and forecrown and a rufous stripe above the eye and lore. Differs from the more common Rufous-browed peppershrike by its black-tipped bill, thinner rufous superciliary stripe, and olive neck and cap.
ID text from Wikipedia, CC BY-SA 4.0

Rufous-browed Peppershrike
Cyclarhis gujanensis
The adult rufous-browed peppershrike is approximately 15 cm (5.9 in) long and weighs 28 g (0.99 oz). It is bull-headed with a thick, somewhat shrike-like bill, which typically is blackish below and pinkish-grey above. The head is grey with a strong rufous eyebrow. The crown is often tinged with brown. The upperparts are green, and the yellow throat and breast shade into a white belly.
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: Black-billed Peppershrike and Rufous-browed Peppershrike.