Freshwater Mussel and Saltwater Mussel shells

Freshwater Mussel and Saltwater Mussel shells

Observation - Freshwater Mussel and Saltwater Mussel shells - UK and Ireland. Description: Of course, the habitat should be freshwater AND saltwater, but you can't choose that, can you? These two mussel shells were empty when picked up. The Freshwater one (left) comes from a flooded gravel pit, the Saltwater example from a Norfolk beach. Cle

Of course, the habitat should be freshwater AND saltwater, but you can't choose that, can you?
These two mussel shells were empty when picked up. The Freshwater one (left) comes from a flooded gravel pit, the Saltwater example from a Norfolk beach. Clearly both mussels, but when they're side by side, the differences are obvious.