I need help because one of my eggs as started zipping, but it has stopped and an hour and a half as already gone by. I looked inside the egg (through the incubator) with a flash light and noticed a sticky air cell. I might need to assist it, but I've never done this before. Here's a picture.
Any clues on what I should do? Wait, help or what? It looks like its struggling to, I can see the beak and its breathing heavily. Help please.