Some Echinoderms Feed

By Ejecting Their Stomachs

Starfish in particular will digest prey by extruding their stomachs through their mouths. Many species favor shellfish especially, using their tube feet to grip and pry open the shell. The starfish then ejects its stomach into the shell, which secretes digestive juices to dissolve the contents, before sucking it back up into its body along with its liquefied meal.