This freshwater mussel is called the lilliput. When the lilliput is full grown it will only be 1.5 inches long, or the size of a silver dollar.

This freshwater mussel is called the washboard. When the washboard is full-grown it will be 11 inches long, or about as long as a sheet of notebook paper. When fully grown, the washboard could weigh 3 to 5 pounds!