I have evidence of an egg eater in my coop.
It's not all the time, but every so often I will find an egg that someone has started to peck the end of, once or twice I found an egg with a hole on one end and the insides gone, and once I caught my girls all going after one of these emptied eggs on the floor.
Any ideas on how to catch the perpetrator? I've heard of the trick of putting mustard-filled eggs in the coop to give the thief a nasty surprise, but I don't know how well it works. I know to up the girls' protein and calcium to help prevent this, and I also collect the eggs regularly. Other thoughts?