A retractable foot, a siphon for sucking up water, powerful muscles, and, sometimes, a pearl ... Old shell. Benji: Oh, I got a crab. Narrator: Then we stumbled upon what's known as a honey ...

Natural pearls form when some kind of irritant, usually a small organism, makes its way into the shell of a mollusk like an oyster or a mussel. To protect itself from the invader, the mollusk ...