Attributes / relations provided by
♦ ¹del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.
♦ ²FEEDING ECOLOGY OF ALBERTINE RIFT ENDEMIC BIRDS IN THE VOLCANOES NATIONAL PARK: REGAL SUNBIRD, RWENZORI DOUBLE-COLLARED SUNBIRD AND RWENZORI TURACO, Marie-Laure Rurangwa, NATIONAL UNIVERSITY OF RWANDA, 2011