How do sea turtles navigate across thousands of miles of ocean to return to their nesting sites, and what are some theories explaining this ability?

Sea turtles are believed to navigate using a combination of magnetic sensing, visual cues, and the Earth’s magnetic field. They may use the magnetic field to create a mental map, and landmarks and ocean currents to fine-tune their path. Some research suggests that sea turtles can detect the Earth’s magnetic field and use it to guide them over long distances.