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Actually, the rocks aid in their digestion. The gizzard grinds the rocks together to break down whole grains. The rocks slowly wear down until they are small enough to pass into the intestines. Then the birds pick up more rocks. It's something they do naturally. They would have a difficult time digesting whole grains without them.
Well that contradicts the opinion of our avian vet, who said it was abnormal for her to be eating rocks that large...