About 24 hours before any hatch, the chick will peck a small air hole in the egg (a PIP) and it may look like a tiny triangle crack protruding from its natural shape. About 24 hours later, it will make a circle of the Pip's and is called a Zip. That is when it will break out of the shell.
Just so you know, if you do open the door and have such a hard time with humidity coming back up, a quick short mist of water from a spray bottle will help out and bring the humidity up pretty quick.
Just so you know, if you do open the door and have such a hard time with humidity coming back up, a quick short mist of water from a spray bottle will help out and bring the humidity up pretty quick.