We just took in 3 hens, 2 chicks & 1 RIR roo. We initially were not going to raise chicks, just buy them. But now that we have the roo, kind of excited about future babies. I have a total of 12 hens, plus the 2 chicks & 1 roo. Most of my hens are not of laying age yet, but the 3 new ones are. Probably a really dumb ? but when we get ready to leave eggs to hatch, how can you tell if they are fertilized???? And I've heard about using incubators....can't mom just hatch her own??? Do they need to be removed from coop after hatching??