Black-cheeked Gnateater
Conopophaga melanops
Measuring 11.5 cm (4.5 in), the black-cheeked gnateater is a small round bird with a short tail. It exhibits sexual dimorphism, as the male has distinctive coloured plumage and the female is a more overall brown in color. The male has a black face and cheeks with a contrasting orange crown and white throat. The upperparts are brownish and the underparts pale grey, the belly feathers more white and the flanks tending to buff. The female is more brown above with a white eyebrow and buff patch on the wings. It resembles the rufous gnateater.
ID text from Wikipedia, CC BY-SA 4.0

Rufous Gnateater
Conopophaga lineata
It is a small, rounded bird, 13 cm in length with a short tail and fairly long legs. The plumage is mostly reddish brown. There is a white stripe above the eye (grey in the female) which ends in a tuft of feathers which can be hidden. The call is a series of quiet cheeps which become faster and higher-pitched. At dusk and dawn the males make a buzzing sound with their wing feathers as they fly around their territory. The rufous gnateater feeds by moving quickly from one perch to another through undergrowth close to the ground.
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-cheeked Gnateater and Rufous Gnateater.