Small, hyperactive bird with a curved bill. Breeding males are colorful, with iridescent upperparts, and a yellow belly in most of the range, and a white belly in southwest Madagascar. Females are much duller, but can be told from female Madagascar Sunbird by their smaller size, smaller bill, and less distinct streaks below. Common in any habitat with woody vegetation. Feeds mainly on nectar, and flits around constantly. The song is a cheerful and explosive jumble of high-pitched notes.