The Rise and Fall of the Dinosaurs: A New History of a Lost World: The Definitive Dinosaur Encyclopedia with Stunning Illustrations, Embark on a Prehistoric Quest!

by Steve Brusatte

There is only a little bit of space between the left and right tracks in the sequence, just a few centimeters. There’s only one way for an animal to make tracks like this: by walking upright, with the arms and legs right underneath the body.