I waited until day 26 to open the egg and see what was going on. He had developed so well until the last couple of days, I noticed he stopped moving. He was dead when I opened the egg and had the yoke sack attached to his belly, but otherwise, looked fine. What happened? I used one of those little 3 egg incubators and was sooo happy it was working rite up until the end... Does it have to do with the humidity?