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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Evidence for the savannah hypothesis comes from divergent sources.
Other indications for the savannah hypothesis are mentioned by Heerwagen and Orians (1993).
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