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Sharks have officially shown that they can circumnavigate the globe using Earth s magnetic fields. Wired said scientists have been baffled for five decades as to how sharks travel 12,000 miles a year from South Africa to Australia and return to the same breeding grounds. There are no street signs to guide them and no fixed landmarks to guide them for most of the journey. Currents and water levels are normally changing. The sun goes down at night and the stars fade away throughout the day. Yet the sharks continue to swim and charts a nearly perfect straight line through the ocean. ....
Sharks use the Earth s magnetic field to navigate the world s oceans, a new study has found. How sharks navigate thousands of miles to return to the same breeding ground every year has mystified scientists for 50 years, with experiments difficult to run. But a study on juvenile bonnetheads found the fish are sensitive to alterations in the planet s magnetic field and use it as a form of GPS. Scroll down for video Sharks use the Earth s magnetic field to navigate the world s oceans, a new study has found. Pictured, the study design with wild bonnetheads This image shows Bryan Keller of Florida State University holding a bonnethead shark. Twenty of these sharks were used in the study ....