Is it possible for eggs that were sat on/incubated at the same time to develop at different rates? I have a hen that had 8 eggs under her. We brought 3 out of the incubator when she started setting, that had been in there a day. Now I knew those would hatch earlier than the others, but figured 1 day was no big deal. We brought 6 eggs inside the house, cause 2 hatched on Saturday, then nothing, and she was trying to leave the nest. Out of the 6 we brought in, one hatched Sunday evening, and 2 so far today. 2 of the other eggs look alive, their veins are still looking pretty good, and one has pipped. But one of the 2 that have nothing going on, looks good as far as the veining, but it looks like it is a few days behind in development. There is more space in the egg than in the other eggs. And it's not the air sac, I know what that is. The part that has the chick has quite a bit of empty space in it still. I know it wasn't laid by a different hen, because it is one of the hen's eggs, that was setting on them. Is this possible?