Spinosaur

Late Cretaceous Period: 96-66 million years ago. Spinosaurus remains have been found in Northwest Africa, Morocco, and Algeria. This prehistoric monster had an elaborate sail on its back. Broad, skin-covered spines over 6 feet long projected upward from the backbone. Two different purposes for these spines have been suggested. The sail may have been used as a heat exchanger or it may have been a recognition feature for other Spinosaurus. Spinosaurus was a giant, 40-50 feet long and weighed more than 4 tons.