text: Its coiled castings are a familiar sight on a beach at low tide but the animal itself is rarely seen except by those who , from curiosity or to use as fishing bait , dig the worm out of the sand .
simplified: Lugworms make the coiled tubes of sand that are a familiar sight on a beach at low tide but the lugworm itself is not seen except by people who dig them up from curiosity or to use as fishing bait .