Tyrannosaurus rex was one of the most ferocious predators to ever walk the Earth. With a massive body, sharp teeth, and jaws so powerful they could crush a car, this famous carnivore dominated the forested river valleys in western North America during the late Cretaceous period, 68 million years ago., Velociraptors were actually feathered animals. They grew up to 100 pounds, about the size of a wolf. And they likely hunted solo—using their claws to clutch rather than slash prey—when they roamed central and eastern Asia between about 74 million and 70 million years ago, during the late Cretaceous period, Allosaurus Allosaurus was the king of the Jurassic predators in North America. The powerful jaws of the Allosaurus held nearly 70 sharp, thick teeth. The claws on its three-fingered hands measured up to 8 inches (20 centimeters) long., is a pterosaur known from the Late Cretaceous period of North America (Maastrichtian stage); it was one of the largest known flying animals of all time. Quetzalcoatlus is a member of the family Azhdarchidae, a family of advanced toothless pterosaurs with unusually long, stiffened necks., The Dimetrodon is a genus of predatory carnivores that lived during the Permian period, 280 – 260 million years ago. Although they are sometimes grouped with dinosaurs, these animals were more closely related to mammals than to true reptiles and evolved long before the dinosaurs did., The Diplodocus is very long with a whip-like tail and a low-slung body in contrast to the raised head and larger body of the Brontosaurus. It also has a smaller head with large pointy teeth sticking out for tearing vegetation to swallow as well as many small spikes along its back, shoulders, and hips., Possibly the largest-known ankylosaurid, Ankylosaurus is estimated to have been between 6 and 8 meters (20 and 26 ft) long and to have weighed between 4.8 and 8 metric tons (5.3 and 8.8 short tons). It was quadrupedal, with a broad, robust body., Mosasaurus (/ ˌmoʊzəˈsɔːrəs /; "lizard of the Meuse River ") is the type genus (defining example) of the mosasaurs, an extinct group of aquatic squamate reptiles. It lived from about 82 to 66 million years ago during the Campanian and Maastrichtian stages of the Late Cretaceous., Dilophosaurus was one of the earliest large predatory dinosaurs, a medium-sized theropod, though small compared to some of the later theropods. It was also the largest known land-animal of North America during the Early Jurassic. Slender and lightly built, its size was comparable to that of a brown bear., Kaprosuchus (also known as a Boar-Crocodile, in reference to its boar-like front teeth) was a genus of crocodyliform from the Cretaceous period. It was similar to another species, Anatosuchus . Baby Kaprosuchus were about the size of a large rat, but after five years, they grew to be around six meters (twenty feet) long.,

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