trees are a mean of minor mussels
mussel is shellfish. blue_mussel is mollusca. swan_mussel is mussel. ring_pink_mussel is mussel. little_wing_pearly_mussel is pearly_mussel. marine_mussel is mussel. mussel is mollusk. winged_mapleleaf_mussel is mussel. freshwater_mussel is mussel. edible_mussel is marine_mussel.