this technique is called worm grunting, and it acts as a worm call. : r/Damnthatsinteresting

Worm charming - Wikipedia

Worm grunting mystery solved

Woodcock teaching it's young how to hunt for worms. : r

Worm charming is a method of attracting earthworms from the ground

Saving hornet from big parasites : r/Damnthatsinteresting

How to call up Earth Worms with a WORM GITTER or RATTLER and

An American woodcock and her two chicks are searching for food

Worm Grunting

Is this sitar worth anything ? : r/Sitar

A Fascinating Phenomenon