Stegosaurus ungulates (U.S. National Park Service)

Some Dinosaurs May Have Wagged Their Tail to Help Them Run

Some Dinosaurs May Have Wagged Their Tail to Help Them Run

Some Dinosaurs May Have Wagged Their Tail to Help Them Run

Stegosaurus ungulates (U.S. National Park Service)

Some Dinosaurs May Have Wagged Their Tail to Help Them Run

Stegosaurus ungulates (U.S. National Park Service)

Some Dinosaurs May Have Wagged Their Tail to Help Them Run

Some Dinosaurs May Have Wagged Their Tail to Help Them Run

Some Dinosaurs May Have Wagged Their Tail to Help Them Run

Some Dinosaurs May Have Wagged Their Tail to Help Them Run

Two-legged dinosaurs may have swung tails to run faster, say