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Around 23 million years ago, North America's sabre-toothed cat-like animals disappeared, leaving the continent without felines for several million years. Now palaeontologists are solving the mystery of this "Cat Gap"

John day fossil beds national monumentUnited statesNew mexicoChelsea whyteKoktaro shutterstockSchankz shutterstockNick famosoEdward drinker copeScientist default imageNorth america