The best-selling I Wonder Why series has always been the perfect place for children to find the answers to their questions. With their quirky style and informative text, these books are great for gripping the imagination and for developing reading skills. Designed to amuse and intrigue the young reader, I Wonder Why Fish Grew Legs answers all sorts of fascinating questions that children ask about prehistory. Illustrated with stunning, high-quality artwork, a wealth of information is backed up with fun facts and lively cartoons. When did life on Earth begin? What killed the dinosaurs? When were elephants as small as pigs? - discover the answer to these questions and much, much more.