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While not as big as T. rex, Acrocanthosaurus was the largest predator of its time, probably partially thanks to its 68 menacing teeth, which were thin and serrated, like a steak knife. Its arms look small, but Acrocanthosaurus probably used them to hold onto prey during an attack.

• Early Cretaceous, 115-105 million years ago
• Southwest United States
• Carnivorous
• 13 feet tall, 30-40 feet long