Do you know why there were more days in the year in dinosaur times? How many hours it can take to excavate a dinosaur fossil? Step back in time and find out all the facts in this awe-inspiring black-and-white chapter book about the prehistoric world and the amazing creatures that once roamed Earth. You'll come face-to-face with spectacular reptiles that dominated the skies and seas while dinosaurs ruled on land - from towering forest browsers like Diplodocus and Barosaurus to the deadly Tyrannosaurus and Allosaurus with their bone-crushing jaws.