Copper-throated sunbird

The copper-throated sunbird (Leptocoma calcostetha) is a small passerine within the Nectariniidae family. They sustain themselves by consuming nectar as well as small invertebrates. As a member of the Nectariniidae family, they possess downward curved beaks and have pectoral tufts of yellow feathers. They are found in south-eastern Asia, predominantly in coastal regions.

Copper-throated sunbirds are small sized birds ranging from 12.2–13 cm. A mature individual's wingspan averages 57.5mm, while their tails average 45.5mm. Adult males are predominantly black birds with contrasting shimmering green on their heads, shoulders, upper back and rump; as well as a copper colored throat with an outer ring of shimmering purplish-blue that extends down to the chest. They possess black legs and black eyes with no eye ring. They boast a down-curved black beak and yellow pectoral tufts which is concealed beneath the wing; both of which are shared traits by many other species in the Nectariniidae family. Additionally, adult females also have black legs and a down-curved black beak, but their eyes possess an incomplete white eye ring. Their undersides are olive-yellow whilst their backsides are grayish-olive. The iconic copper throat is replaced with a grayish-white color which contrasts their gray heads. Juveniles are similar to the females, however, the grayish-white throats are swapped for a yellow one with occasional dark scaling.