Human skeletal changes due to bipedalism There are at least twelve distinct hypotheses as to how and why bipedalism evolved in humans, and also some debate as to when. Bipedalism evolved well before the large human brain or the development of stone tools. This dimorphism has been seen as an evolutionary adaptation of females to bear lumbar load better during pregnancy , an adaptation that non-bipedal primates would not need to make. In addition to the change in shoulder stability, changing locomotion would have increased the demand for shoulder mobility, which would have propelled the evolution of bipedalism forward. It is important to distinguish between adaptations for bipedalism and adaptations for running, which came later still.
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