A Big Magnet in a Small Fish - ScienceNOW - 0 views
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After spending 3 years at sea and traveling up to 300 kilometers away from home, a rainbow trout can swim straight back to its original hatching ground, following freshwater streams inland and rarely heading in the wrong direction
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likely relies on many senses; the fish have superb eyesight and smell
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trout also seem to rely on Earth's magnetic fields, which point them in the right direction
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