Whales and dolphins are our closest living relatives in the underwater world. This comprehensive guide offers an incredible insight into the exciting lives of these mysterious mammals. You can learn how to tell the difference between whales and dolphins. You can discover what whales and dolphins eat, why certain species feed co-operatively, and why many of the largest whales filter and skim water for their food. Exciting feature spreads allow you to observe detailed and dramatic aspects of whale life, such as a killer whale attacking a seal for food. * This book covers all aspects of cetacean life and biology, including relative size, bones, survival, hunting and feeding, intelligence, sounds and song, breeding, swimming, migration, conservation, and much more. * It has special focus features take an in-depth look at particular aspects of the species, such as a bottlenose dolphin giving birth or a humpback whale filter-feeding. * It is packed with amazing wildlife images from some of the world's top natural history photographers. * Detailed cross-sections and diagrams reveal the complex inner workings of a whale's body. * It is an ideal reference guide for use at home or school for 8- to 12-year-olds.