There were 6 eggs that didn't hatch. We waited until we were certain that they hadn't made it to the final stage, and then took off the shell to try to determine what day they had made it to. The smell was DISGUSTING but the kids were troopers. Everyone wanted to be the one in charge so we had to draw names to pick the leaders. We found out that they all were very close to hatching, and cannot determine what happened.