From the moment life crawled out of the oceans and onto land, to when our primate ancestors climbed down from the trees, the history of Planet Earth is filled with incredible stories. This beautifully illustrated guide explores some of the most exciting and incredible events in evolution, through 13 case studies. Step back in time and discover a world where whales once walked, crocodiles were warm-blooded and snakes had legs! Meet terrifying giant birds, and tiny elephants living on islands in this fascinating creature guide like no other. Learn how whales once walked on four legs before taking to the oceans; how dinosaurs evolved into birds; and how the first cats were small and lived in trees. Featuring a stunning mix of annotated illustrations, illustrated scenes and family trees, evolution is explained here in a captivating and novel style that will make children look at animals in a whole new way. This book is from the Incredible Evolution series, a fascinating, informative collection of books which examine the development of life on earth. Other titles available include: When Plants Took Over the Planet, When We Became Humans, and When Dinosaurs Conquered the Skies.