Study shows how skates, rays and sharks sense electrical fields

Sharks, rays and skates can hunt for prey hidden in the sandy sea floor by ‘listening’ for faint traces of bioelectricity — they can literally sense their prey’s heart beating. The basic anatomy of the electro-sensory organs that accomplish this feat has been known for decades, but the biological mechanisms — how electrosensory cells pick up faint electrical signs of life — has remained a puzzle.

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