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Tyrannosaurus Rex was the most feared predator on earth, but to one particular dinosaur, he was prey. A discovery in Montana reveals the broken and fractured bones of a juvenile T-Rex, and the teeth of its attacker. Experts measuring the size and shape of the teeth are able to identify the attacker as Nanotyrannus. As more bones emerged, paleontologists get an unprecedented look into 65 million year old battle and help answer questions about the origin of Nanotyrannus, the “Tiny Tyrant”. http://www.history.com/jurassic