Thanks, that sounds like it might be it. They don't seem to mess with the yoke so I was hoping they hadn't started eating. They are new birds got them last spring late. Ill keep an eye on it, the insight was appreciated.
About once a week or so I find a messy yoke in the nesting box. It's happened 4 or 5 times and every time there has been no trace of a shell. I was wondering if this is the hens or if I have another animal getting in the coop? If it is the hens what can I do about it?