All do, no think. Sometimes that's great, but when it comes to incubating eggs, there has to be a little compunction. The BF has been steadily feeding eggs into the incubator and I'm very pleased about that. Waiting for the eggs to finish seems to be a problem for him. He's helped a couple out of their shells with success and now he wants to help all of them. He keeps asking how long it takes from pipping to hatch. All I can say is that it takes as long as it takes. If they have a hole to breathe through, WAIT, it will happen. If it doesn't happen, there's a reason, and it's not just because you didn't help. We had one turkey die in the egg yesterday and this morning he's trying to help one that started pipping sometime in the night on Sat. He finally stopped because it started bleeding. Way to go Dr. Doolittle.