Digestive System

Echinoderms have a simple digestive system with a mouth, stomachs, intestineand anus. In many, the mouth is on the underside and the anus on the top surface of the animal. Sea stars can push their stomachs outside of their body and insert it into its prey allowing them to digest the food externally. This ability allows sea stars to hunt prey that are much larger than its mouth would otherwise allow.