Starfish or sea stars are echinoderms and are part of the family including sea urchins, sand dollars and sea cucumbers. Although some have more, sea star typically have five arms and can amazingly regenerate lost or damaged limbs. This can also be used as a means of self defence.
Starfish or sea stars are echinoderms About 1,500 living species of starfish occur on the seabed in all the world's oceans, from the tropics to subzero polar waters. Description from pinterest.com. I searched for this on bing.com/images