Egg shells are a good source of calcium, but they need to be sterilized. Crunch them up and put them in the microwave for a minute -- that's long enough to get rid of any germs. You can also cook them in a frying pan, if you are scrambling an egg for your birds. Just toss in a few small pieces of shell and cook it with the egg. It's especially important that female birds get enough calcium, because they can start laying eggs at any age. I had a Nanday conure who I believed was a male, until she started laying eggs. The same thing happened with a white-capped Pionus that I had.
We also have chickens, and we crush up eggs and microwave them to give to the chickens. They seem to enjoy them.
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