Speedy and lean this carnivore picked up scraps for supper. At twenty feet long Dilophosaurus weighed half a ton. With three claws on its hands this dinosaur had an extra claw on its feet called a dewclaw. Light on his feet Dilophosaurus left footprints similar to birds and could run surprisingly fast. Fun Facts: If the two crests on his head were put together they would be about the same size as a dinner plate.