Birds need to ingest soluble gravel for behavioral and/or nutritional reasons. Specially ground to suit all caged or aviary birds, HARI Ground Oyster Shells are fully digestible gravel that provides a natural source of calcium, which is required by all caged birds year round, and is essential for reproduction and the formation of strong eggshells.
Additionally, small amounts of soluble gravel in the diet can be beneficial for birds with digestive issues. If you suspect your bird is having digestive issues, consult an avian veterinarian to find out if your bird needs soluble gravel.