I have a hen that's been sitting on 11 or 13 eggs...not sure how many. on the 16ht of this month I separated her from the other hens cuz they all kept coming in and plunking more eggs in her nest to the point she couldn't cover them all. The first eggs had been laid around the 1st but I don't have them all marked for dates. Since the 16th she been left alone and not bothered. She has her own hotel room....a totally separate cage the size you could put a saint Bernard in with a nesting box. OK So today I went out to check on her and she had kicked an egg out. It was cracked all over but not open and it was empty. Then I see in the front "lip" of the nest the shiny egg remains. No tiny baby thankfully... just the raw egg. Did she know that the gig was up and that egg needed to go? It was marked as being laid on the 2nd of Mar. Can they tell that the egg is "overdue" or bad? She hatched some out last year but she didn't have this many eggs and there were a couple duds.