The Spinosaurus was a dinosaur that lived during the Cretaceous period in North Africa, approximately 100 million years ago. The Spinosaurus is a theropod dinosaur and may be the largest and longest of its kind, weighing as much as 6 tons and being 49 feet long. At present the Spinosaurus is believed to have been the world's largest carnivorous dinosaur, weighing more than the Tyrannosaurus Rex. The Spinosaurus had a long and narrow skull, making it look like a crocodile (only much larger), and had long spines extending upward from the vertebra which looked similar to a sail and was likely to have had skin connecting them. The name 'Spinosaurus' means 'spine lizard.'