https://www.wildlifetrusts.org/wildlife-explorer/invertebrates/slugs-snails-and-freshwater-mussels/freshwater-pearl-mussel
Freshwater pearl mussel | The Wildlife Trusts
Freshwater pearl mussels spend their adult lives anchored to the river bed, filtering water through their gills and improving the quality of the water for...
freshwater pearl musselthe wildlifetrusts