Very cute run..So I did make a run out tonight and bought some grit. However all I could find was high calcium grit, which I've read isn't good for young birds. I bought it anyways and did offer it to them in the cap, but they haven't touched it yet. I will make a trip to the actual feed store tomorrow and make to get some regular chick grit for them.
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Oyster shell shouldn't be used until the birds begin laying eggs. Even a bowl of driveway dirt and small rocks will suffice.