Ankylosaurs are common features on documentaries or animated films about dinosaurs. Their armored body and club-like tail make them easy to identify. But how did that tail actually evolve? Evolutionary biologists show us the “first draft” of a popular dinosaur.
Although a few dinosaurs were adapted to live underwater, most dinosaurs were landlubbers through and through. And perhaps no dinosaur had less business going for a swim that this fellow, the heavily-armored, 13,000-pound Ankylosaurus.