Newton's sunbird (Anabathmis newtonii)

Newton's sunbird, or the São Tomé sunbird is a species of bird in the family Nectariniidae. It is endemic to São Tomé Island. It is one of the smallest sunbirds. In general, the bird has dark olive upperparts - the male has an iridescent green-purple throat and upper breast region, while females have a dull olive throat and yellowish underparts, but underparts in female youth do not develop into yellow until later sexual maturity.