I read the recent compost article and thought it sounded logical, but once I dumped our kitchen compost container in the chicken pen, I have several questions. 1. Egg shells. I compost these regularly. If I let the hens eat the shells, will they break and eat their own eggs? 2. Paper towels & paper napkins. I also pop these in our compost. Can any harm come from sticking these into the chicken pen? 3. What about coffee grounds? 4. Anything else I have to be careful about? Or can I assume the chickens will discriminate safely?