The poultry digestive system is very different from both the ruminant and non-ruminant digestive systems. It consists of several organs that neither the ruminant nor the non-ruminant have. These organs include the beak, crop, gizzard, proventriculus, cloaca, vent, and ceca. Even though the other two digestive systems each include a cecum, the poultry has two which is why it has what's called ceca. Unlike the other two digestive systems, this system doesn't chew its food. This is due to the fact that the beak has no lips or teeth. Instead, the food is ground in the gizzard. The gizzard may also contain some grit which is added to aid in digestion. Whereas the other two systems take their time in digesting food, the poultry digestive system moves food very rapidly. Because of this, they need food that is very high in nutrients.