Article: Florida's 'worm grunters' collect bait worms by inadvertently imitating mole sounds.

When biologist Ken Catania heard about the peculiar practice of worm grunting practiced in the Apalachicola National Forest in the Florida Panhandle one of his first thoughts was an observation made by Charles Darwin (see also Vanderbilt University).

Worm grunting involves going into the forest, driving a wooden stake into the ground and then rubbing the top of the stake with a long piece of steel called a rooping iron. This makes a peculiar grunting sound that drives nearby earthworms to the surface where they can be easily collected for fish bait.

Despite a lot of speculation, worm grunters don't really know why the technique works. But Catania, an ...

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