How changing planetary ring affects the migration of terrestrial fauna?
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Imagine a gas giant as massive as Jupiter has a enormous planetary ring which will expand and contract throughout its orbit around a main sequence star.
Then there is a moon as massive as Mars and it has a molten core and liquid water on its surface, usually certain migratory animals on Earth develop the ability to sense and trace the magnetic field to their respective breeding ground. However on the hospitable moon this pattern is disrupted by the changes of the ring, how is it possible?
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