A hundred and fifty million years ago, an aging Stegosaurus lay down for the last time, settling in the mud of what is now northwestern Colorado. It had lived a comfortable life by dinosaur ...

He debunks myths about the Stegosaurus' spikes and the T. rex's vision in "The Lost World: Jurassic Park," starring Julianne Moore and Vince Vaughn. He discusses how Pteranodons flew and moved ...