what causes them? I'm on day 21 with no signs of pipping or movement. To make a long story short, I won some eggs from a seller, received 30, 4 were broken. On day 14, candled and only had 12 that had grown and were fertile. They had saddle air cells then. Temps have been 99.5 - 100, humidity 36-46% for first 18 days, then 76% for the last 3. No known spikes in temp or humidity, not my first hatch, but first time with this breed (not sure that would make a difference). Any ideas? Oh, and I added some silkie eggs 3 days later that are normal looking. No funny looking air cells and apparently thinking of joining the circus after hatching the way they were flopping around in those eggs. Today makes day 18 for them. Thanks!