The Olive-backed Sunbird, Cinnyris jugularis, also known as the Yellow-bellied Sunbird, is a species
of sunbird found from Southern Asian to Australia. They are small songbirds, at most 12cm long. In
most subspecies, the underparts of both male and female are bright yellow, the backs are a dull brown
colour. The forehead, throat and upper breast of the adult male is a dark, metallic blue-black.

Source: Wikipedia