Meet Spinosaurus: The First Swimming Dinosaur

Spinosaurus aegyptiacus is among the weirdest dinosaurs to have ever roamed the Earth. It is 50 feet long and seven tons in weight, with an enormous "sail" upon its back, an elongated snout resembling a crocodile's, and conical teeth. Past reconstructions of its body included a narrowing tail akin to those of its theropod cousins. But now, a new discovery of an almost complete tail showed what looks like a giant paddle.