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Acrocanthosaurus (pronunciation: ak-ro-KAN-tho-SAWR-us) is a genus of carnosaurian theropod dinosaur from the mid-Cretaceous Period of what is now North America. It was one of the largest bipedal carnivorous dinosaurs, with one mounted specimen reaching a length of 11.5 meters (38.3 feet) and an estimated weight of 4.16 metric tonnes (4.6 tons). Many of its vertebrae had high neural spines.