What's inside a clam? A retractable foot, a siphon for sucking up water, powerful muscles, and, sometimes, a pearl. And you thought oysters were fancy. Following is the transcript of the video.

Pearls are made by marine oysters and freshwater mussels as a natural defence ... Nacre can form naturally around almost any irritant that gets inside the shell, creating some very unique and precious ...

The second one, well, is a glove with an oyster set in it, with a baseball that is supposed to look like a pearl inside the oyster. But to some who saw it online, the oyster resembles part of the ...

A natural pearl will form in an oyster when a foreign object, like a grain of sand, gets inside the shell. To protect itself, the oyster will coat the unwelcome visitor with layers of nacre ...

Pearls are the result of a mollusc's reaction to irritants ... These translucent animals are known to swim inside clams and oysters to hide from predators. However, for the individual that concealed ...

Most pearls come from oysters ... This ligament keeps the valves open, allowing the oyster to feed. Inside the shell, the oyster has several parts: the mouth (palps), stomach, heart, intestines ...