A superb introduction to the watery world of some of nature's most fascinating creatures, this book gives the young reader an insight into the way these appealing animals live. The book begins with a comprehensive introduction to whale and dolphin families and discusses the differences between a delphin and a porpoise. Dramatic illustrations lead the young reader into the rivers, seas and oceans of the world, exploring how the different whale and dolphin families live together, produce young and communicate, as well as the reasons why so many of these magnificent animals are in danger, and what can be done about it.