Human Ancestors May Have Butchered Animals 3.4 Million Years Ago

Cut marks on two 3.4-million-year-old animal bones from Ethiopia were thought to be evidence that the beasts had been trampled by other animals long ago, but new research suggests that's not the case. The new results debunk one theory for how the bones got their marks, and support — but do not, on their own, definitively prove — the alternative hypothesis that ancient human ancestors cut the bones. Combined with recent evidence that human predecessors used stone tools about 3.3 milli