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Acrocanthosaurus (meaning "high-spine lizard" because of the spikes growing out of its spine) was a fierce predator that was roughly 30-40 feet (9-12 m) long and weighed about 5,000 pounds (2300 kg). It had a big head, with a 4.5-foot (1.4 m) long skull and 68 thin, sharp, serrated teeth. It had 17-inch (43 cm) spikes extending from its vertebrae, along the neck and tail that may have formed a thick, fleshy sail on its back. It had powerful arms, and each hand had three fingers, equipped with long, sickle-like claws. They were one of the dominate predators of Texas and Oklahoma during the Cretaceous Period 115-105 million years ago.