The genus Homo includes modern humans and closely related species and evolved from australopithecine ancestors around 2.3-2.4 million years ago with the appearance of Homo habilis. Several australopithecine species including Australopithecus garhi, Australopithecus sediba, Australopithecus africanus, and Australopithecus afarensis have been proposed as direct ancestors of Homo but there is no consensus on which one was. Homo habilis lived from around 2.33-1.44 million years ago in eastern Africa. Modern humans, Homo sapiens, are the only remaining hominids and are characterized by