When the whales walked

"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 . . . 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 . . . 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"--OCLC.