I just did an eggtopsy on my partially zipped egg. The shell was about a quarter of the way zipped. The chick was dead. It had turned in the shell, without zipping, so it was pointed at the opposite side from where the zip was. Why would this have happened? I have another partially zipped right now that I'm worried about. He's making a lot of noise, and flexing against the shell, but no new zip in the past hour. I think he might have turned, too, and not zipped all the way. Same parents as the dead chick, egg the same size and shape. I'm really worried about him right now.