This is a very goog article- even for grownups. I want everyone at Pearl-Guide Forum to be interested in freshwater mussels- the home of some of the best pearls ever grown!
LINKThere are over 300 different kinds of freshwater mussels in the United States and Canada. Their shells come in many different colors and textures. You can find freshwater mussels in just about every state, including Alaska! Some kinds of freshwater mussels are harder to find than others. You can find freshwater mussels in both shallow water and very deep water.