The Red-billed Hornbills are a group of hornbills found in savanna and woodland of sub-Saharan Africa They are now usually split into five species, the Northern Red-billed Hornbill (T. erythrorhynchus), Western Red-billed Hornbill (T. kempi), Tanzanian Red-billed Hornbill (T. ruahae), Southern Red-billed Hornbill (T. rufirostris) and Damara Red-billed Hornbill (T. damarensis), but some authorities considered them all to be subspecies of a single species.