01/02/2026
Did the ancestors of humans walk upright or on four legs? As reported in The Washington Post this morning, a new analysis of fossil remains from Sahelanthropus tchadensis—a 7-million-year-old hominid discovered in Central Africa—suggests that Sahelanthropus may have been the earliest known human ancestor to walk habitually on two feet.
Terence Capellini, a professor in the department of human evolutionary biology at Harvard University has spent the past several years analyzing human pelvic evolution to explain why bipedalism may have evolved.
Research highlights our evolutionary ancestors’ unique pelvis.