How can we say that society practice division of labour at the time of homo erectus.
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Savannah woodlands replaced tropical forests between 2.5 and 2.7 million years ago (or 3.3 to 2.4 mya) during an ice age that caused an 11 degree drop in global temperatures. The Pleistocene (0.045-1.8 million years ago) (Sci. Am. 1994, Oct.), a period of climatic change marked by cold spells, repeated glaciation and the shrinking of tropical forests, followed. Australopithecines share a common ancestor with the lineage that evolved to become H. habilis . This ancestor to the Hominidiae branched in two directions. One branch, led to the robust australopithecenes and the other to H. habilis . A. afarensis , which became extinct about 2.9 million years ago, is believed to be the direct ancestor of H. habilis (Avers, 1993). A. africanus became extinct about the time of the appearance of H. habilis , not allowing enough time for the evolution of the one into the other. So close are the two, that some scientists thought the two were the same species (Parker, 1992). Paranthropus robustus and P. boisei ( Zinjanthropus boisei (Leakey, 1959)) existed when the first hominine , Homo habilis lived in East Africa 1.44 to 2 million years ago (Nature, 2007) (1.9 to 1.6 Mya by other estimates (Lemonick & Dorfman, 1999) million years so there must have been distinct separations of their ecological niches during this time (Coppens, 1994). All Australopithecines were extinct by less than one million years ago.