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A pair of Chalicotherium feeding on leaves by Julio Lacerda

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from Toptenz.net

Top 10 Bizarre Prehistoric Animals

The Helicoprion is said to have lived during the Carboniferous period and was one of the few creatures able to live through the Permian-Triassic extinction event (‘The Great Dying’). Eventually the Helicoprion went extinct during the Triassic period. The creature had teeth that are very much like a circular saw. It had so many teeth because as new teeth grew, the older teeth were pushed out and into the middle to create the spiral. Length-wise the creature was said to be 10-15 feet.

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