Three clingfish species, "Cochleoceps bicolor", "C. orientalis" and "Diplecogaster tonstricula", have become cleaner fish. Large fish approach them and allow the small clingfish onto their body where the clingfish eats tiny parasites. In contrast to this mutualistic relationship, certain clingfish species that live among the spines of sea urchins appear to be part of a more varied relationship. It can be either commensal (the clingfish gains protection from the sea urchin spines, but apparently neither benefits nor is a disadvantage to the sea urchin) or parasitic (the clingfish gains protection, and eats tube feet and pedicellaria from its sea urchin host).