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Walking Upright: Sahelanthropus tchadensis

Sahelanthropus tchadensis has two human anatomical traits: small canine teeth, and walking upright on two legs. We believe it walked on two legs because the large opening where the spinal cord exits out of the cranium from the brain is located further forward (on the underside of the cranium) than in apes or any other primate except humans.

The female human evolution.

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