Day 20 for Mama and her 4 eggs and I have a question. Will they start breaking through the shell late tonight or do they start tomorrow? I remember the last hatch with her, it was day 21 and I went to go check on her and one chick was peeking it's head out. It was in the morning too. I read that it can take 24 hours or more to get all the way out though. So it had me thinking. This stuff is very intresting for me!