Numerous photos and explanatory illustrations make this book an attractive introduction to the science of animal movement. It briefly treats a variety of topics, from types of skeletons, to a squid’s jet propulsion, to the way a flying squirrel glides. The advanced vocabulary may put off some readers, even though most of the words are understandable in context or defined at the back of the book, but kids who like learning the correct technical term for everything will revel in words such as exoskeleton, pectoral fin, and patagium.