"Like a finely tuned harp, the whiskers on a rat's snout pick up particular frequencies and send these teensy signals to the brain. Now scientists have caught the whisker signals on video.

With poor eyesight, rats must rely on their whiskers to navigate dark, dismal sewers and other underground haunts. Past research has shown that like harp strings, the shorter whiskers positioned at the front of rats' snouts are tuned to vibrate at higher frequencies and the longer ones at lower frequencies. "

http://www.livescience.com//animals/080227-rat-whiskers.html
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