They are therefore related to sea cucumbers, sea urchins, and sand dollars. There are at least 1,900 different species of starfish, and they do not all look the same. The one in this clip is Luidia ...

Learn how to make a marbled hydro dipped starfish craft. This summer craft idea is great for all ages. Hydro ...

He then goes on to specify how biologists believe crown-of-thorns starfish were able to replicate this trait. He says it was born from a characteristic of a completely different type of starfish.