Description wikipedia

The northern double-collared sunbird (Cinnyris reichenowi), is a species of bird in the family Nectariniidae. It is found in Burundi, Cameroon, Central African Republic, Democratic Republic of the Congo, Equatorial Guinea, Kenya, Nigeria, Rwanda, South Sudan, and Uganda. The northern double-collared sunbird is a medium-sized species. The adult male's head and back is a metallic green that has a steely-blue sheen in some lights. The rump is greyish-brown, the uppertail coverts metallic purple and the tail black, glossed blue. The main flight feathers are dark brown. There is a narrow purple collar beneath the metallic green throat, above a scarlet breast and pale brown belly. There are pale yellow pectoral tufts that are not always visible. The eye is black or dark brown, and the beak and legs are black. The adult female is more drab with upper parts dark olive green and a dark brown tail. The underparts are greyish-olive, the belly being tinged with yellow. The juvenile is similar to the adult female. Northern double-collared sunbird was originally described as Cinnyris reichenowi from Eastern Africa, but this species was formerly subsumed within greater Nectarinia along with the majority of African sunbirds, in which case it is referred to as Nectarinia preussi. This shift is due to the fact that golden-winged sunbird Drepanorhynchus reichenowi has taxonomic priority when also included in Nectarinia. This nomenclature shift has caused confusion between northern double-collared sunbirds and golden-winged sunbirds. Furthermore, due to this nomenclature conflict, eastern populations are sometimes referred to as Nectarinia preussi kikuyuensis due to the unavailability of reichenowi within the genus Nectarinia, and the availability of the synonym kikuyuensis.