An Atlantic triton (Charonia variegata) attacks an urchin (Arbacia lixula) in Donousa island. Atlantic tritons are gastropod molluscs that walk slowly to the seabed looking for food. Once they locate an urchin they pull out their mouth that looks like a brown tube. They slowly turn upside down the urchin and with their radula, a chewing anatomical structure at the base of the oral cavity, break the shell off the fragile underside of the urchin. The triton takes about half an hour to catch and devour the urchin.