The humpback whales communicate with each other by slapping their tails on the surface of the water. When a calf is attacked by an animal, its tail can be severed, allowing it to escape. These illustrations and simple text add to the enjoyment of observing the amazing tails in the animal kingdom: they swish, they ripple, they vibrate, they rustle. In addition, the detailed information and amusing activities related to the topic are presented in an easy-to-read and understand format.