She would know if they are bad, and would eat any as their instinct is to keep nests clean. If she just tossed it outside the nest, it could potentially attract predators. Or it broke while other hens were getting in to lay with her, and she was just disposing of broken egg.I could just cry! Not only do I have 40 eggs in incubator, I now have 3, (three) hens setting. Oh, the humanity of it all! I'm certain the only, maybe 1/3 of the incubating eggs will hatch, for a variety of reasons. One of the hens kept jumping nests, so not sure how many of those. The 2nd hen got on her nest and hasn't moved. The 3rd in on hers only 3 days but I put some of my pretty wooden begs under her and pull the real ones every day.
I already asked if they would accept day old baby chicks, but am wondering, hen #1 was found with egg yolk on her beak the other night.. Does she know if some weren't going to hatch or when they were double decking, another hens eggs got under her? Can she tell?