Stranding of whales occurs repeatedly. Dozens to hundreds of animals follow a lead animal to shallow beaches from which they cannot return to the sea. Biologists suspect that disturbances in the Earth's magnetic field or irritating noises from ships, wind turbines, and other sources have misled the whales. What do we know about these fascinating creatures? What distinguishes whales from dolphins? How do they navigate in the ocean? The "What is What Junior" series is aimed at preschool children and early readers. The texts are kept short, and discovery flaps open up new perspectives. Small games and puzzles deepen initial knowledge.