The mysterious moustache of an aquatic snake may help it "see" in murky waters by detecting subtle currents generated by its prey. Ken Catania and colleagues at Vanderbilt University in Nashville, Tennessee, used a hair to deflect the upper-lip tentacles of tentacled snakes (Erpeton tentaculatum), and recorded the resulting nerve activity. The tentacles proved to be exquisitely sensitive to even the tiniest deflection.
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