Most people see sand dollars only after they're deceased. Those white "shells" found along the beach ... Like its body art, these perforations serve an important purpose when the echinoid is ...

They’re a smooth shell with a very pronounced swirl. Technically, a sand dollar is a sea urchin which means what washes up on the shore is a rigid skeleton called a test. It’s none for the ...

Live sand dollars don't look like those perfectly white "shells" you see in gift shops. The living creatures are much darker, usually somewhere between brown and purple. The white sand dollars you ...