I have been saving all my shells from hard boiled eggs for months to give to my girls. Two questions: How fine should the shells be crushed before offering? I think I read somewhere that if they get larger pieces, they might see a freshly laid egg as food and crack them.
Second question: Is it safe to use the shells from raw eggs? If so, how do I clean them to keep them sanitary?
Second question: Is it safe to use the shells from raw eggs? If so, how do I clean them to keep them sanitary?