Researchers later realized that a femur found alongside the skull fragments belonged to the hominin, but when it was first analyzed, researchers saw no evidence for bipedalism. Those findings, published in 2020, contradicted the earlier hypothesis and raised doubts as to whether the species should be considered a hominin at all. “The field is kind of split right now on how to interpret these fossils,” says Scott Williams, a paleoanthropologist at New York University, who co-authored the new analysis but who was not involved in the 2020 study.