Some call it "worm grunting", "worm snoring" or "worm charming", but whatever the name, we are now closer to understanding why a peculiar grunting sound drives worms out of their holes: they think it is a mole.
Worm grunting involves driving a wooden stake into the ground and then rubbing its top with a long piece of steel called a rooping iron, to produce a deep grunting sound. The vibrations drive earthworms out of their burrows, where they can be collected for fishing bait – sometimes in their thousands.
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