One of the earliest up-right walking hominin species, Sahelanthropus Tchadensis, was discovered by a team led by the French paleoanthropologist Michel Brunet in what is now northern Chad and would have lived between 6 and 7 million years ago. We only know it was an up-right walking hominin because foramen magnum (where the vertebrae enter the skull) was faced downwards. In a chimpanzee, the foramen magnum faces more towards the back indicating knuckle walking. Even though the skull was the only part of the skeleton found, it still offered so much incredible information about how we evolved.
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