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Spinosaurus aegyptiacus is an enigmatic species of theropod dinosaur from the Late Cretaceous of North Africa (~113-93 mya). The first specimen was discovered in 1912 by German paleontologists and fossils collectors, but these fossils were lost in the bombing of Munich during World War II. Using photographs, fragmentary remains and newly discovered partial skeletons, paleontologists are beginning to piece together the biology of this dinosaur. It had a long slender skull, like that of a crocodile, and enormous neural spines of the vertebrae on its back which would have given it a sail. Recent discoveries have shown that its leg bones were more compact than those of other theropod dinosaurs, suggesting that it spent a large part of its life in a semi-aquatic environment, probably hunting for the giant fish that lived in the North African rivers in the Cretaceous. Size estimates have suggested that it is the largest known theropod dinosaur, and at around 50 feet in length, it is longer than the longest T. rex known.



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