Chicken gizzard is the chicken's stomach (i.e., chicken gizzard). The avian stomach is divided into myogastric and glandular stomachs, with the glandular stomach being smaller to secrete gastric juices, and the myogastric stomach being larger and fleshy to be in charge of storing and grinding food, and the gizzard refers to the myogastric stomach. Since birds such as chickens do not have the teeth to chew their food, they eat things such as grain, grass seeds, and bugs that are swallowed. The whole food is not digested or absorbed, and the food is ground up in the bird's stomach. The muscle tissue of the gizzard is very developed, which often contains grit and stones eaten by chickens, and the gizzard is constantly contracting and writhing, and the grit and stones grind up the food so that it can be absorbed from the food. 7