Crustaceans are a diverse group of animals with at least 65000 species worldwide but here at the Estuary there are less than twenty to be found. While some are residents, many are washed up after storms or arrive hitching a lift on either debris or seaweed. Most are free-living in either freshwater or a marine environment but one group, the familiar slater or woodlouse are terrestrial (land) based. Other species include crabs, crayfish, shrimps and barnacles. More information on Crustaceans can be found on the following links here and here.