what is the longest dinosaur that swims
Terrifying 'swimming dinosaur' unearthed: Fossils of 97-million-year-old Spinosaurus reveal giant predator ate sharks whole. The largest predator to walk - and swim - the Earth was a terrifying cross between Tyrannosaurus rex, a crocodile and a whale. The discovery was made from fossils dug up in the Moroccan Sahara, which show that the Spinosaurus was the first dinosaur to have adapted to an aquatic lifestyle. Weighing 20 tonnes and measuring almost 50ft (15m), the swimming dinosaur was 9ft (2.7m) longer than the largest T. rex specimen known.