Savannah Hypothesis

A passé paradigm in anthropology that held that the transition by early hominids to bipedalism was driven by external contingencies—e.g., venturing from the forests into the open grassy savannah. Per the savannah hypothesis, walking on all fours left early humans physically vulnerable to hazards in the environment
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In recent years the role of woodlands in producing some human characteristics has gained acceptance (O'Higgins & Elton 2007), but the original savannah hypothesis still underpins many discussions of human origins (Cerling et al.
The original savannah hypothesis proposed that aridification thinned out the forests and forced hominins out of the trees onto savannah plains via an intermediate stage involving the use of the remaining trees for security (Dart 1925).
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