An introduction to whales for young readers. It is part of a series which explores the behaviour and lifestyles of different animals, all of which are in danger. The series explains the concepts of endangerment, extinction and animal protection at a very simple level. The book features a general introduction to animals in danger, before focusing on whales. It follows the whale through its daily life, looking at its appearance, behaviour, habitat and special characteristics. It then explains why the whale is in danger, what the danger is, and what measures are being taken to restrict or prevent the danger. Care is taken to show the difference between danger from humans and the environment, and the "natural" danger animals face in the wild.