Scientific name: Aethopyga siparaja (Raffles, 1822). This bird is a juvenile male.

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. Sunbirds are
found in tropical Africa, India, and the forests of Southeast Asia, including the Philippines. Typically Sunbirds are small, the males of most species are brightly colored,
with metallic, sometimes velvety plumage. The females of most species of Sunbirds look very similar... an olive-green back, yellowish breast and white tips to the
outer tail feathers.

Books: Sunbirds: A Guide to the Sunbirds, Spiderhunters, Sugarbirds and Flowerpeckers of the World