All the branches of the animal kingdom - birds, fish, crustaceans, reptiles, mammals, insects, and even slime moulds undertake great journeys across water land or air. This is a glorious celebration of the mysteries and marvels of migration. Migration is one of the great mysteries of the natural world. With no compass or GPS devices, birds fly thousands of miles from Europe to their African feeding grounds, salmon cross oceans so that they may return to the rivers in which they were born and monarch butterflies spend their entire adult lives traveling from the grasslands of the Midwest to the forests of Mexico. This book takes a close look at how and why different animals migrate. The science of migration is broken down into clearly understood texts, and then brought to life in case studies of individual species. Simple text packed with fascinating facts and details are accompanied by eye-catching illustrations that illuminate the fragility and wonders of our extraordinary planet and the species that inhabit it.