The Purple-banded Sunbird is one of the many Sunbirds that have recently been moved to the genus Cinnyris from the genus Nectarinia. Cinnyris bifasciatus has three subspecies which differ in the shade of the colour of their plumage, the width of the breast band, and bill length. In Kenya there are 2 subspecies : Cinnyris bifasciatus bifasciatus and Cinnyris bifasciatus microrhynchus. It inhabits Coastal bush, mangroves, forest edges and riverine forests and thicket. Food includes nectar, insects and spiders. They are found singly or in pairs, except when birds (up to several hundred in some cases) aggregate at good nectar sources. These Sunbirds move restlessly between food sources, males constantly chasing both females and other males of their own species.
Source : birdforum.net