Dinosaurs ruled the Earth for millions of years--and they still rule the record books! That's because they had to be extreme to survive in those prehistoric days. So meet the creatures that have never been equaled: Amphicoelias, who outsized all the other dinos; Struthiominus, the fastest runner; Spinosaurus, the biggest two-legged predator that ever lived; and many more. In addition to the fun facts and figures, there's a timeline, a box that compares each dinosaur's size to a human's, and information on who named the dinosaur.