Discover the astonishing truth about our aquatic cousins: how they think and what they know, their experiences and unique behaviours, and the many things we have in common.There are 33,000 species of fish on our planet, and that number is constantly increasing. In context, that is more than all the species of mammals, birds, amphibians and reptiles added together, making fish the most numerous vertebrates on our planet. Waters worldwide are teeming with these elusive creatures, but how much do we really know about them? Grouped into thematic chapters - including the Dangerous and Deadly, Unusual Giants and Mini Marvels - inside biologist Doug Mackay-Hope profiles the secret lives of 50 of our most interesting underwater cousins in this insightful and myth-busting text, complete with charming watercolour diagrams and expert insights.Foreword by Jeremy Wade, presenter of River Monsters and Mighty Rivers, and official fish aficionado.