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11 animals that have a sixth sense

By: Bryan Nelson on Sept. 22, 2010, 1:20 p.m.
Salmon get up close to a camera lens

Photo: Bill Perry/Shutterstock

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These fish somehow find their way back to spawn in the same rivers from which they were born, despite traveling great distances in the open ocean during their adult life. How do they do it?

Though it is still largely a mystery to science, many suspect that salmon utilize ferromagnetic mineral magnetite deposits in their brains to pick up the Earth's magnetic field. It has also been discovered that they have a refined sense of smell and can tell the difference between the smell of their home stream from any other.