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Saved by uncleflo on May 19th, 2012.
The origin of bipedalism, a defining feature of hominids, has been attributed to several competing hypothesis. The postural feeding hypothesis (Hunt 1996) is an ecological model. The behavioral model (Lovejoy 1981) attributes bipedality to the social, sexual and reproductive conduct of early hominids. The thermoregulatory model (Wheeler 1991) views the increased heat loss, increased cooling, reduced heat gain and reduced water requirements conferred by a bipedal stance in a hot, tropical climate as the selective pressure leading to bipedalism.
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