There are two kinds of bear shells. One is called the little bear. It is a small shell. The bear-paw shell is different. It is a big shell with two parts. Each half looks like an animal foot. Some names of shells do not make any sense. The apple shell doesn't look like an apple at all. And the dog shell doesn't look like a dog. The butterfly shell is very plain. Many other shells look more like a butterfly than that one does! But the heart shell does have the shape of a heart. Not all heart shells are red. Some are yellow. Others have brown spots.