The carnosaurs seemed to grow larger in the Cretaceous period. For example, the carcharodontosaurid dinosaurs Giganotosaurus (“giant southern lizard”) from South America and Carcharodontosaurus (“jagged teeth lizard”) from North Africa and Morocco were two huge carnivorous theropods. They were probably heavier than the well-known Tyrannosaurus rex. In fact, some scientists believe the fossil skull of a Carcharodontosaurus found in Africa in 1995 indicates that the dinosaur may have been the largest meat-eater of all—larger than a T. rex at 36 to 44 feet (11.1 to 13.1 meters), though this is still debated. Another Cretaceous carnosaur was the Spinosaurus, from the Late Cretaceous period, in Niger and Egypt, Africa. One specimen had one of the longest skulls of any carnivorous dinosaur known, estimated to be about 5.75 feet (1.75 meters) long. These dinosaurs are known for the tall spines on their back and lived 100 to 93 million years ago.