Hello! I am currently incubating 15 duck eggs for a school project, it is now day 26 and only a few of the eggs have wobbled, and I have felt several pecking against their shells, but not all of them. I candled the eggs on day 17 and they were all alive and developing. I stopped rotating the eggs today and I am not planning on opening the incubator until they hatch, but i'm just a little bit concerned that not all of them seem to be moving. I don't believe any of them have pipped internally, I definitely haven't heard any cheeping. is this normal? I have noticed that the ones I haven't seen moving are farther from the heater in the incubator, could it be that they will just hatch later than the other chicks because they weren't quite as warm?