A tiny bird of forest and scrub from the lowlands to low elevations in the mountains. Darker above and paler below, with a fairly long, thin, slightly curved bill. Races differ in color. Northern birds have brownish bellies, while southern birds are black or dark brown above and whitish or pale gray below. Females are duller. Similar to Bicolored Flowerpecker, but White-bellied has a longer, thinner bill. Also known as Buzzing Flowerpecker, as it gives a high-pitched insect-like buzz.