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Tyrannosaurus Rex was a carnivore. It is the most well-known dinosaur of all-time. It walked on two legs and its arms were very small compared to the rest of the enormous body. The length of a T-Rex arm is about the length of a full-grown human arm. It was part of the theropod family in the Tyrannosauridae group. Its head was the size of a normal household bathtub. Tyrannosaurus Rex was forty (40) feet long.