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In the past, scientists assumed that our direct ancestors were the only toolmakers. But two big fossil teeth found along with the tools at the Kenyan site belong to an extinct human cousin known as Paranthropus.
The mystery will be a tough one to solve.
According to new research led by researchers with the National Museums of Kenya, Liverpool John Moores University, the Cleveland Museum of Natural History, and the Smithsonian's National Museum of Natural History, early human ancestors used some of the oldest stone tools ever discovered to butcher hippos and pound plant material in Kenya around 2.9 million years ago.
Get latest articles and stories on Science at LatestLY. According to new research led by researchers with the National Museums of Kenya, Liverpool John Moores University, the Cleveland Museum of Natural History, and the Smithsonian's National Museum of Natural History, early human ancestors used some of the oldest stone tools ever discovered to butcher hippos and pound plant material in Kenya around 2.9 million years ago. Science News | 2.9-million-year-old Butchery Site Reopens Case of Who Made First Stone Tools.
New excavations that reveal a pair of gigantic molars alongside the Oldowan toolkit raise questions about which human ancestor made the tools.