Tiny, round, short-tailed bird with a long curved bill. Breeding males are blue on the back and yellow below, with bright bare skin around the eye. Non-breeding males and females are dull olive-green. Madagascar endemic that is found in the canopy of eastern and northern rainforest. Hyperactive nectar feeder that constantly flits from flower to flower. Call is an accelerating series of quiet and very high-pitched notes. Similar to the scarce Yellow-bellied Sunbird-Asity, but has duller olive underparts and a larger, more curved bill. Smaller than Souimanga Sunbird, with a thinner bill and shorter tail.