The past 2 days we have got home from work and found 3 eggs over the 2 days, pecked and eaten or rements of a shell in the nest boxes. I think it was the weekend gone I thought one of the girls had laid a no shell egg but now I'm thinking it had been eaten! We have 9 girls that have been together about 12 months, various ages, different breeds, about 7 or 8 layers - 2 consistant, and 3 or 4 who like to go broody together. One of our regular layers, Rosie, well, her shells have become more brittle. I plan to add more grit to the diet in the morning. One of our rescue non-layers, Nugget, has been going to bed earlier than normal and slightly more lethargic but still a full crop and active enough I haven't worried when she is out. She sleeps in the coop that I found 2 eaten shells today. Everyone was in bed when we got home. We have 3 different coops for them to sleep and lay in. we have one rooster added a few months ago. He is a scared little silkie. Hubby doesn't think he is capable and I hope he isn't. These chooks are our babies, I am happy to separate for a time but I WILL NOT CULL OR SELL my chickens, I am hoping for suggestions on how to find out who and how to treat the culprit. Thanks in advance. Pip.