Sharks have been swimming in the oceans of the world for over 300 million years. Dinosaurs vanished from the earth, but sharks survived, with very little change. This fascinating series profiles five of the most interesting shark families, explaining their life cycles, behavior, and habitat. Easy-to-read text presents scientific information clearly and accurately, while the breathtaking full-color photography captures these mysterious demons of the deep in their shadowy underwater world. Each book contains an index, bibliography, glossary.