Image: Side view of Homo habilis skull cast
A cast of a 1.9-million-year-old Homo habilis skull (KNM-ER 1813) discovered in1973 by Kamoya Kimeu in Koobi Fora, East Turkana, Kenya. This adult skull has a brain size of only 510 cubic centimetres, which is only just above the average for species placed in the Australopithecus genus
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