Vastatosaurus Rex is the main antagonist in King Kong. They are descendants of Tyrannosaurus Rex. It was 20-25 feet (6-7.6 meters) tall, 50-60 feet (15.2-18.2 meters) long and weighed 10-15 tons (20,000-30,000 pounds). They were killed by King Kong. It can run up to 25 mph and can jump really high for its size and mass.