Black-tailed Myiobius
Myiobius atricaudus
The black-tailed myiobius closely resembles the whiskered myiobius (M. barbatus) and the sulphur-rumped myiobius (M. sulphureipygius) in appearance, with olive upper parts and a yellow rump. The underparts differ in being buff rather than tawny or greyish-olive, but birds living in eastern Brazil tend to have yellowish or yellowish-buff underparts. Another distinguishing feature is the location in which the bird is seen.
ID text from Wikipedia, CC BY-SA 4.0
Ruddy-tailed Flycatcher
Terenotriccus erythrurus
The ruddy-tailed flycatcher is 9.0–10.3 cm (3.5–4.1 in) long and weighs 7 g (0.25 oz). The upperparts are grey-olive, with a rufous rump, tail, wings and eye ring. The throat is buff and the breast is cinnamon, becoming pale buff on the belly. Sexes are similar, but young birds are brighter above and have a browner tail and breast. It has a see-oo see call, and a repetitive eek eek eek eek eek song. It sometimes flicks both wings up to make a faint whirring sound.
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-tailed Myiobius and Ruddy-tailed Flycatcher.