Unlike most giant predators, it spent much of its life in the water. Fossils show it had dense bones for diving, paddle-like feet, and a long tail that helped it swim through rivers and swamps around 95 million years ago.
At over 14 meters (46 ft) long, Spinosaurus may have been longer than Tyrannosaurus rex, making it one of the largest carnivorous dinosaurs ever discovered.
Its crocodile-like jaws were filled with cone-shaped teeth perfect for catching fish, including enormous prehistoric sawfish and coelacanths.
Scientists still debate exactly how aquatic it was, but one thing is certain: Spinosaurus was unlike any other known dinosaur.
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