The movement of the stones by the muscles of the gizzards breaks down the bird’s food. Food is passed back and forth between the proventriculus and the gizzard.
The gizzard can grind the food with previously swallowed grit and pass it back to the true stomach, and vice versa. In layman’s terms, the gizzard ‘chews’ the food for the bird because it does not have teeth to chew food the way humans and other mammals do.
The gizzard is the second chamber of the stomach and it consists of very tough muscles. These muscles are used to grind and digest various types of foods. The muscles don’t do this process alone. Many birds pick up small pebbles, sand or grit while they are eating and these items end up in the gizzard.
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