I have apporox 35 Buff Orp eggs in the 'bator. This will be my 3rd hatch (hopefully). We candled them last nite (day 10) and I have a couple questions. In several, there appeared to be a dark "shadow" on the large end of the egg, but no real definitive shape or movement. In approx a dozen of them, we saw what we have seen on the 2 previous hatches...a very defined dark "shape", a dark spot (probably the egg) and some movement. Can there be that much developmental difference between the eggs? Are the ones with a dark shadow "bad"? Should I just wait a few more days and candle again? Need some advise as I have never seen this much difference between eggs before. THANKS