An animal's stomach is composed of three parts: the RUMEN, the CRAW, and the MAW. The RUMEN is a large chamber in the stomach of ruminant animals, such as cows, sheep, and goats, which is used for fermenting plant-based food. The CRAW is a muscular pouch located at the base of the neck in some animals, such as chickens, turkeys, and ducks, which stores food before it enters the digestive system. The MAW is a muscular organ found in fish and other aquatic animals that helps to grind up food before it is digested.