this technique is called worm grunting, and it acts as a worm call

Responses of earthworms to worm grunting vibrations. A. The

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Earthworms Missouri Department of Conservation

Worm grunting: How can thousands of worms be summoned from the earth?

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TIL about worm grunting. This is a procedure when a strip of metal

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Worm grunting: How can thousands of worms be summoned from the earth?