Worm cast

This article is about a structure created by worms. For information about worm castings (excretion) used in gardening, see vermicompost.

Lugworm cast, Red Wharf Bay, Isle of Anglesey

A worm cast is a structure created by worms, typically on soils such as those on beaches that gives the appearance of multiple worms. They are also used to trace the location of one or more worms.