I have set a seven brown eggs I got from a friend of mine in a new incubator I just built [Rush Lane cooler/bator design]. This is the first time for this incubator and only my second time incubating eggs. When I got the eggs from her one of the eggs had a lot of spider web like cracks in the shell and I was wondering if I should even bother trying to incubate this one. I candled the egg when I got it home and the shell was solid and I did not notice any other abnormalities. The eggs have been in for 7 days now and when I candled them all today to check for embryo's [all 7 have developing chicks in them] I noticed that the air sac in this egg is not in the end of the shell but more on the side towards the middle of the egg. The egg has a developing chick inside which was moving around vigorously. Here is a picture of the egg in question Has anyone else seen this before? Should I let the chick come to term or should I end the incubation now? My concern is that the chick will be born deformed and I will have to put it down anyways which I feel will be alot harder to do. Any info would be greatly appreciated. Thanks UPDATE: All my eggs have hatched even the one with all the structural cracks and the air sac on the side produced a perfectly healthy chick. Here is some pictures of the chicks. The black one is from a set of eggs that I had recv'd from a friend that out of the 6 eggs I got from her this was the only fertile one - and he/she hatched on Thursday. The yellow ones I got from another friend and they started hatching today. I have seven total and two are still in the incubator drying out as they just emerged at 8:30.