A fairly well-known one, this, but oh well.
Sharks have the ability to sense the electrical signals given off by movement in water.
They do this with a series of jelly-filled pores, which can detect the electromagnetic field of other animals.
Hammerhead sharks in particular rely on this sense, which is why their head looks so strange; it allows for a greater surface area to work with, making their head a sort of electromagnetic "metal detector."
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