Are 4-million-year-old Stone-knife Marks on Bones a Croc?

Observing the marks that crocodile bites leave on bones indicates that evidence of stone-tool use in Ethiopian millions of years ago is nothing of the sort

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Some 4.2 million years ago in Ethiopia, an ancient hominin butchered animals using stone tools. Or maybe a crocodile ate supper. Somebody left linear marks and pits on animal bones in the Plio-Pleistocene era,...