I have 8 chicken and 2 duck eggs hatching as a homeschool project with my sons. They built a wooden incubator with a plexiglass front with dad, and as of last night, at 16 days gestation for the chicks there was movement visible in all 8 eggs; at 23 days gestation there was movement in both duck eggs (I swear I thought I saw a little webbed foot pressed against the shell, is that possible?!) Theh problem is, these turn out to be Muscovy Ducks which take another full week to hatch from other ducks. I had thought these would all be hatching at the same time by getting duck eggs a week older but... Now I am worried about increasing the humidity for the chickens to hatch, and I am reading here that you can't let eggs stay in an incubator where hatching is going on because of disease. Will I drown the ducks by increasing the humidity level for the chicks to hatch, and will I kill the ducks if I let the chicks hatch in there with them then sterize the incubator? I have to admit, I am getting seriously attached to these little guys. My son is always wanting to start some kind of business (he's an 8 year old determined entreprenneur, lol) and I am thinking this might be a good one! Also, when they hatch, how will I tell boys from girls?