Spinosaurus was one of the largest or possibly the largest theropod dinosaur to ever walk the earth. It measured a proximately 52 feet in length and estimates calculate that the dinosaur may have weighed 10 to 15 tons. It is believed that Spinosaurus was larger than Tyrannosaurus and even Giganotosaurus.
It had a long and narrow skull like modern crocodiles. Other similarity between Spinosaurus and mother crocodiles was its teeth. They were cylindrical rather than curved; they were design for crushing and not for slicing like the teeth found in other theropod dinosaurs. One of the most noticeable anatomical features in Spinosaurus was its “sail”. It grew out of its back, and it is estimated that at its highest point it measured 6.5 feet tall. It was made up of spike-shaped spines of bone that extended from its backbone, joined together by a layer of skin. There are many theories about the use of Spinosaurus’s sail. The most popular of these is that it was used to regulate the dinosaur’s body temperature. A huge network of blood vessels would have run through this sail, acting as a radiator to absolve or dissipate heat. This would have been a very important mechanism for Spinosaurus, since it was a cold-blooded reptile, it would have absorbed heat when it was needed to increase its metabolism. Another theory suggests that Spinosaurus’s sail was brightly colored and it would have been used by males to attract females. In much the same way today’s peacock uses its tail “fan”. Spinosaurus was discovered in 1915 by a fossil hunter named Stromer. The specimen was an incomplete find of Spinosaurus and included several, different anatomical structures. The Spinosaurus’s specimen was destroyed in WWII, during the British bombing of Munich in 24th - 25th April in 1944. The building housing the Spinosaurus specimen was severely damaged and none of the specimens discovered were salvaged. However detailed drawings, descriptions, and photographs of the specimen still remain.