From this site, WORMCHARMING.COM. "Instead they have light sensitive cells on the surface of their bodies to tell them the difference between light and dark. Worms do not like light, and tend to stay underground during the day,coming out at night to look for food. They are also sensitive to pressure change and vibrations allowing them to adapt quickly when they feel the tapping of raindrops on the ground. When worms detect rain they will rise to the surface to prevent themselves from drowning.Interestingly, there are world-wide worm charming competitions and champions use this trait to charm the worms out by tapping astick on the floor to recreate the effects of rain drops' vibrations. So next time you see a random person hitting a stickon the ground numerous times, don’t be too alarmed!"
Go to... http://www.wormcharming.com/
Photo by 071106 1252 worm by Dan4th
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