This giant carnivore was a native of South America. It could grow up to 48 feet and weigh 7 tons. It was larger than a T-rex and fiercer than a Spinosaurus. They can easily eat their prey, which were usually helpless the moment they start attacking. It was believed to have immediately taken down a full grown argentinosaur, which was also massive. No one would have messed with these dinosaurs as they were like the king of the jungle.