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
Tawny-breasted Myiobius
Myiobius villosus
The tawny-breasted myiobius grows to a length of about 14 cm (5.5 in). The upper parts are mainly dark olive, and the rump is yellow. There is usually a yellow patch on the crown in males that is normally kept hidden; this patch is cinnamon-brown in females. The underparts are mainly reddish-brown, the throat is dull white and the centre of the belly has a pale yellow patch. The otherwise similar sulphur-rumped myiobius (Myiobius sulphureipygius) has paler upper parts and much yellower underparts, with tawniness only present at the sides.
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 Tawny-breasted Myiobius.