a mussel is a kind of water animal
marine_mussel is not mussel. freshwater_pearl_mussel is mollusca. edible_mussel is marine_mussel. marine_mussel is mussel. zebra_mussel is freshwater_mussel. freshwater_mussel is not mussel. swan_mussel is mussel. mussel is shellfish. mussel is mollusc. freshwater_mussel is mussel.