13. Leatherback Sea Turtle
The leatherback sea turtle undertakes some of the longest migrations in the animal kingdom, crossing vast ocean basins between feeding grounds and nesting beaches. Scientists have discovered that leatherbacks navigate using a combination of the Earth’s magnetic fields and subtle changes in water temperature. This allows them to pinpoint distant destinations with incredible accuracy, despite the ever-changing nature of the open sea. Their journeys highlight the sophisticated natural GPS built into these ancient mariners. Source: WWF