Green Sea Turtles’ Magnetic March
Green sea turtles navigate oceans with an internal GPS that would make any smartphone jealous. These ancient mariners swim more than 2,600 miles across open water, following invisible magnetic highways to find tiny nesting beaches. Female turtles return to lay eggs on the exact shores where they hatched decades earlier. Their bodies contain crystals of magnetite that act like living compass needles, letting them read Earth’s magnetic field like a road map.