Oysters range from about 2 to 12 inches (5 to 30 centimeters) in length.

Oysters have soft bodies enclosed in a rough, oval-shaped shell that is often grayish or brownish white in color.

Oysters are known as bivalves because their shells have two parts, or valves.

Oysters can change their gender.

Humans eat about two billion pounds of oysters every year.

Oysters are very healthy food source, they are loaded with vitamin C, D, and the B vitamins. They’re also a good source of calcium, iron, and phosphorus.

Many species of oysters are edible and are usually served raw or cooked.