When most people imagine a ferocious dinosaur, Tyrannosaurus Rex comes to mind. Researchers believe, however, that the Utahraptor was probably the winner of this title. It was intelligent, cunning, and measured around 23 feet from head to tail. The Utahraptor lived during the Early Cretaceous period and resided in North America. It walked on two legs and had retractable claws that were nearly 10 inches long.

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