Acrocathosaurus
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