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We always used to recommend cuttlefish (Skeleton) for all aviary birds. It used to comes in various sizes, mixed bags of. If you've not seen one it is basically a thin shell one side with a soft calcium area on the otherside. Running a nail along it will reduce it to a white powder.
All birds will nibble on it and it is ideal for helping in shell production for egg laying and providing the required calcium intake.
If your able to collect these from a beach they will require a few days soaking in fresh water to remove the sea salt residue, then drying and bleaching in the sun.
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