Acrocanthosaurus

Given its name (meaning "high-spined lizard") because of the unusually high spines on many of its vertebrae. A bipedal carnivore, it had a large, 4 to 5 feet long head with many thin, serrated teeth.

Length	Up to 11.5 m (38 ft)
Weight	Up to 2.4 metric tons
Period	Early Cretaceous
Location	Southwest United States