I have two that are currently hatching. They have made good size holes in their shells. They are moving and chirping. I can see them working poking at the hole. Neither one has zipped all the way around. Do they continue just working, chipping away at the original hole making it bigger until they come out? One made the initial break in its shell about 15 hours ago, the other one not even 12 hours yet. Are they ok? Are they having trouble? Never done this before and it is so nerve wracking just sitting and watching them work so hard.