Have you ever wondered why some animals have a tail, or scales, or a huge nose ? And do you know why some animals have eyes on stalks, or ears that can swivel, or a sticky tongue ? Read the "Why Do Animals Have" books to find the answers and lots more besides. This series reveals the incredible diversity of the external parts of animals. It also looks at why they are so different, exploring how the animals have adapted to the environment, and how we can group living things according to similarities and differences that we observe.