But paleontologists have been able to piece together the bones of an ancient skeleton, found 1,200 miles apart, which suggests that there was a dinosaur that swam.
The Spinosaurus, the only dinosaur known to have led a semi-aquatic life, is also the largest known predatory dinosaur. It grew to 50 feet in length.
Conical teeth in a crocodile-like snout overlapped like a snare for trapping fish. To breathe underwater, it had nostrils high up in the skull, which worked like a pair of snorkels as it waded into a river. With its flat feet, it’d have paddled like a duck, and propelled with its long, flexible tail.
On land, it moved awkwardly. Unlike its other carnivorous peers, it lumbered on all four legs.