I see this thread is a couple weeks old, but I ran across it because I am having this problem too, big time! I just spent some time in the coop putting covers over all the nes/;.t boxes, and wanted to thank Davaroo for the suggestion. Makes sense to me, chickens don't like to eat in the dark.... but I think mine have turned into the chickens from hell, this winter has brought them all over to the dark side. I am sure it is more than one eating eggs, would I be so lucky to just have one "ringleader". But I did catch one with eggshell, and another highly suspect, so next, they will get seperated. Maybe forever.;
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