A retractable foot, a siphon for sucking up water, powerful muscles, and, sometimes, a pearl ... and mussels, clams are bivalves, a kind of mollusk that's encased in a shell made of two valves ...

“I thought it was a shell or something ... thing.” The clam that it came from is a northern quahog called Mercenaria ...

These translucent animals are known to swim inside clams and oysters to hide from ... that are in its calcium carbonate shell, the mollusc creates a material called nacre, commonly known as ...

Pearls are made by marine oysters and freshwater mussels as a natural defence against an irritant such as a parasite entering their shell or damage to their fragile body. The oyster or mussel slowly ...