Spinosaurus was a theropod dinosaur genus that lived in what is now Egypt, from the Albian to early Cenomanian stages of the Cretaceous Period, about 95 to 93 million years ago. According to a study by dal Sasso et al. (2006), it was the largest of all carnivorous dinosaurs by a significant margin, even larger than Tyrannosaurus rex and Giganotosaurus. Spinosaurus was the longest theropod, measuring 15 to 17.4 metres (49.2 to 57.1 feet) long and standing at 5 to 6 metres (16 to 20 feet) in height. Spinosaurus reached weights up to 9 tons.