Worm Grunting: A Mystery Solved
By HENRY FOUNTAIN
Published: October 17, 2008
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"The mystery has been why the vibrations should cause worms to come to the surface. Kenneth C. Catania of Vanderbilt University has provided an answer: worm grunting mimics the sound of a predator, the eastern American mole, causing the worms to flee topside." .........................
http://www.nytimes.com/2008/10/18/science/21wormgrunting.html
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