Ninety-nine million years ago, a 55-foot dinosaur stalked the river deltas of North Africa. A sail on its back towered over the water as its crocodile-like jaws and curved claws made short work of car-size fish. This was Spinosaurus, discovered in 1915. Paleontologists have since debated how this creature lived. Did it prowl through currents in pursuit of prey, as recent research has suggested, or
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