Great article! I've had a few of those I'd just add one thing under a hole in the egg. For a hole, or circular indent in the egg. One of my chickens will go and peck the eggs to see if they are soft so she can break the shell and eat them. Sometimes they are not soft enough to totally break, but she will leave a small peck indent or hole in the egg's shell if it is not hard enough. I don't have a photo right now, but if I get one, i'll take a photo of it.