What makes a fish a fish? How is a herring different from a shark? What is an Atlantic football fish? Classifying Living Things investigates how and why we group animals. Each book focuses on a particular class of living things, looking at the key characteristics that set its members apart from those of other classes. Discover how classes of living things have evolved, and how species have adapted to suit their environments. Find out why certain animals may show some characteristics of a particular class, but actually belong to another. 'Classifying Fish' looks at the amazing class of scaly swimmers. Find out how fish are grouped into orders and how each one is different from the rest. From salmon to skates, from giant whale sharks to tiny gobies, discover what makes fish so special.