Most starfish feed on slow-moving or stationary animals. Clams, oysters and snails are the diet of choice, though starfish are also known to eat fish eggs and mollusk. The starfish stomach actually extends itself through the mouth to grab and consume food. The material is then transported to the starfish's digestive glands, which are located within its arms. Today, starfish live close to the sea around the world and typically stay in groups of forty or more. Most starfish live in the deepest parts of the sea and are often found hiding under rocks or in tide pools. Starfish are sometimes carried into shore during high tide. These are the starfish you may commonly see on the sand or close to shore. Because starfish can only survive two hours out of water, it's recommended that you leave starfish where you find them.