Imagine a creature as big as a sperm whale, with the instincts of a predator. That's what scientists believe they've found, and they're calling it "Leviathan."

BBC News has the story:

Researchers have discovered the fossilised remains of an ancient whale with huge, fearsome teeth. Writing in the journal Nature, the scientists have dubbed the 12 million-year-old creature "Leviathan".

It is thought to have been more than 17m long, and might have engaged in fierce battles with other giant sea creatures from the time.

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