trees are a mean of minor mussels
marine_mussel is not mussel. freshwater_mussel is mussel. blue_mussel is mollusca. mussel is mollusk. edible_mussel is marine_mussel. little_wing_pearly_mussel is pearly_mussel. swan_mussel is mussel. winged_mapleleaf_mussel is mussel. marine_mussel is mussel. swan_mussel is not mussel.