Fig. 1From: Origin of the Genus Homo Both found in the early 1970s at contemporaneous sites at Koobi Fora, Kenya, these skulls, from left to right, of H. habilis (KNM-ER 1813) and H. rudolfensis (KNM-ER 1470) represent the variation in size exhibited by early Homo. Photographs by Alan WalkerBack to article page