Cryolophosaurus is a dangerous and lethal killer that stalked the forests of jurassic Antarctica.This predator could grow up to 7 m or more in lenght and possibly weigh up to 500 kilograms. Cryolophosaurus was built for speed and was the dominant predator in its Environment. The oddlooking crest was used for display and was weakspot when rivals fought for dominance but its more likley they used non-lethal methods. It was a Close relative to Dilophosaurs who also had a twincrest on its head. Its jaws was filled with sharp teeth and it trashed its prey like ragdoll.