Grind them up

I know this might seem an odd video to most of you. I crush up eggshells for the birds last year I used to dump crushed eggshells in my garden for the calcium for the garden plants I notice the birds were going in there and picking some up and taking them back to their young. I looked the information up on this, and it said birds will feed eggshells to their young to make their beaks harden faster. If you do this, just make sure you wash the eggshells before saving them for grinding later.