How many hearts does an octopus have? Which is the most poisonous animal alive? Why could a penguin never live in a hot desert? Find out the answers to these questions and more in this book. It features stunning wildlife photography of animals in their natural environments. This is throughout every stage of their life cycles. This book teaches young zoologists what distinguishes each branch of the animal kingdom, while sections on habitats like mountains, forests, and grasslands provide a closer look at the particular animals that live in each and have adapted to its unique challenges. Along the way, readers will discover the different diets of carnivores and herbivores as well as, find out how food chains work, and learn about the various kinds of homes animals live in, from bear dens to beaver dams.