Homo habilis cranium (KNM-ER 1813)
Homo habilis cranium (KNM-ER 1813). This cast is of a relatively complete fossil skull named KNM-ER 1813. It was found in Koobi Fora, Kenya in 1973 by Kamoya Kimeu, and is estimated to be 1.8 million years old. H. habilis is thought to have lived approximately 2-1.6 million years ago, and had a brain size just less than half that of modern humans.