Hi all!!, So I've heard of eggs hatching a day or two late, and last year that's what all of mine did. But this year it seams that all of my chicks pip on day 18, then zip and hatch later that night or early morning of day 19. They are all healthy, yolks obsorbed; and I haven't lost one yet!! Every egg in the incubator is developing without flaw. I'm just curious as to what causes this fast development, because I've heard that eggs hatching too early can have a bad outcome. But all of mine are just fine. And yes, they are just regular chicken eggs, assorted mixed breeds! I have guinea eggs in there as well, and they are hatching early too. I'm not complaining, I'm actually excited that I have more room in the incubator to put in a new batch of eggs sooner then expected. Thoughts on this???