Tyrannotitan was a large predatory dinosaur from South America. This close relative of Mapusaurus and Giganotosaurus was nearly 40 feet long and weighed up to 6 tons. It's large skull had dozens of teeth over 6 inches in length. Like it's cousins, this predator may have hunted in packs to bring down larger prey. Tyrannotitan lived roughly 115 million years ago.