Is it true that bowhead whales can live to be over 200 years old and sperm whales have the largest brain in the world? Do whales hold their breath underwater and how do blue whales communicate with their fellow species? With this impressively illustrated book, children can get to know the giants of the oceans and learn everything about their daily lives, social behavior, communication methods, and eating habits. Overview chapters on a variety of topics and a glossary compile background knowledge about life underwater, and there are also numerous suggestions and ideas for protecting the oceans.