A large seedeater with a very thick pinkish bill. Brownish-olive above and yellow below with streaking along the sides. Males are slightly brighter and have thicker streaking below. Both sexes have a yellow rump that is conspicuous in flight. Found in dry thorn savanna and thorn scrub, usually in pairs or small groups. Similar to Brimstone Canary, but distinguished by the notably larger bill, streaked underparts, and yellow rump. The song is twittering, high-pitched, and variable, and can include imitations of other species. The most common call is a sliding “sreeyu.”