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You might be wondering, how do birds digest and eat food if they don’t have any teeth? The digestive system of a bird is unique in the way it breaks down food. Birds use a muscle in their stomach called the gizzard to grind food down into tiny particles ready for further digestion. Once food particles have been processed in the gizzard, they move through the small intestine for nutrient absorption and later the lower intestine for excretion. The gizzard allows birds to have one of the most efficient digestive systems in the entire animal kingdom.