Its tube is built up of sand grains stuck together with slime. Others live in tubes that stick out just above the floor surface, for example, the Pygospio elegans. Some worms, such as rag-worms, dig their way through the bottom. A lot of animals live burrowed in the bottom, such as worms and shellfish. The majority of the North Sea bottom consists of sand and silt. All the different areas in the North Sea have their own characteristic species of animals. Lots of other animals are attached to stones or ship wrecks. If you look closely, you can identify quite a lot of life on the bottom: crabs and sea snails, such as laver spire shells and periwinkles, crawl around. Worms, crustaceans and shellfish live in holes and tunnels under the surface of the sea floor. However, appearances are deceptive: most of the residents are hiding. At first, you don’t see much on the bottom of the North Sea.
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