The secret of how a shark senses its prey

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The secret of how a shark senses its prey: Researchers reveal killers use electrical fields to spot signs of life
Sharks, rays and skates are able to hunt for prey hidden in the sandy sea floor thanks to their ability to 'listen' to their prey's heartbeat.
These animals have electro-sensory organs that allow them to do this, but until now the way they work has remained a mystery.
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