A starfish’s mouth, underneath its flat body, leads directly into a large, bag-like stomach. The starfish can push its stomach out through its mouth. Starfish like to eat clams and oysters. Encircling a clam with its powerful arms, the starfish attaches its sucker-like tube feet to the clam’s shell.
With ever-increasing force, it pulls the two halves of the shell apart. Then, the starfish pushes out its stomach and digests the food. When the starfish has completed its meal, it pulls back its stomach, and leaves only an empty clam shell behind.–Dick Rogers