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The Olive-backed Sunbird, Cinnyris jugularis (formerly Nectarinia jugularis) also known as Yellow-bellied Sunbird is an Asian sunbird.

The sunbirds are a group of very small Old World passerine birds which feed largely on nectar, although they will also take insects, especially when feeding young. Their flight is fast and direct on their short wings. Most species can take nectar by hovering like a hummingbird, but usually perch to feed most of the time.

The Olive-backed Sunbird is common across southern China to the Philippines and Malaysia down to northeast Australia.

Olive-backed Sunbirds are tiny, at most 12cm long. 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. Originally from mangrove habitat, the Olive-backed sunbird has adapted well to humans, and is now common even in fairly densely populated areas, even forming their nests in human dwellings

The birds mate between the months of April and August. Both the male and the female assist in building the nest which is flask-shaped, with an overhanging porch at the entrance, and a trail of hanging material at the bottom end

Source : Internet