Freshwater mussels, also known as clams, are unique animals. Mussels have two hard, external shells and soft tissue inside. They also have only one foot! The movement of mussels is limited. Most ...

Washington, D.C., recently welcomed some new neighbors — about 8,700 of them. That’s how many mussels just were released into the Anacostia River. And residents will have to get used to them because ...