The black sunbird (Leptocoma sericea) is a species of bird in the family Nectariniidae. It is found in eastern Indonesia and New Guinea. Its natural habitats are subtropical or tropical moist lowland forest and subtropical or tropical mangrove forest.
It is a small songbird with a long down-curved bill and iridescent body. The coloring of the birds differentiate between male and female. The male black sunbird is midnight black in color with an iridescent blue-purple stripe across the upper chest. There is a crown of lustrous green on the head, while the wings and tail are glossed blue. In many regions, the throat area is iridescent reddish-purple; however, moving northward it shifts towards a bluish sparkle (Moluccas and Kai Islands). The female black sunbird has a completely different color complex than her male counterpart. Her coloration across the chest and body is dusted greenish-yellow. The wings are smothered brown as well as the head. In northern areas, the color of the female black sunbird is “nondescript,” with a charcoal colored head, with an olive-green upper-body and yellow underbody. The juvenile black sunbird resembles the female sunbird with more of a distinct yellow throat.