http://dsc.discovery.com/news/2008/0...aring-ear.html

Saw this cool Discovery article and thought I'd share.

With each tiny footstep, a mouse or other prey radiates waves through the ground and air the same way drops of water ripple through a pool and produce a single drip sound. Just as a ship bobs up and down in response to a wave in the ocean, a snake jaw resting on the ground responds to sound waves carried by the ground.

"The lower jaw of a snake is essentially a ridged cylinder," said Young. "So in that respect it's not terribly different from a ship."