Bill Bryson, A Short History of Nearly Everything
… Homo emerged from the mists beginning about two million years ago. No one knows quite what the relationship was between australopithecines and Homo, but what is known is that they coexisted for something over a million years before all the australopithecines, robust and gracile alike, vanished mysteriously.… No one knows why they disappeared. “Perhaps,” suggests Matt Ridley, “we ate them.”
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