Summary
Sea turtles that cross vast oceans and return to the same beach use cues from Earth’s magnetic field. It’s like carrying an invisible compass and map at once.
A turtle returning to its birth beach years later sounds like a fairy tale. But the clues it uses to avoid getting lost often come from Earth itself—its magnetic field.\n\nThe field isn’t uniform; its intensity and angle vary across regions. Turtles can read these differences like location cues and adjust their routes.\n\nSurprising detail: it may provide not just direction but a large-scale map sense. The animal could be following a sequence of changing magnetic signatures like landmarks.\n\nThis matters for conservation, too. Human-driven disturbances and light pollution can add risk to an already demanding journey, potentially interfering with navigation cues and behavior.
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