I use this method quite a lot. If I hatch chicks in my incubator and have a hen hatch chicks close to this time, I will sneak the incubator chicks under her. I have also mixed different types of poultry. Right now I have a hen raising two of her own chicks and a TURKEY poult. I don't sneak baby ducks or geese under my hens. I have before but the last time the other chickens pecked the poor little guy all the time. But anything from turkeys, pheasants, and peacocks can go under a standard chicken. If you have bantams, they can care for quail, chukar, and those types of birds. This is a random post, but I see people asking all the time on here. MAKE SURE THE CHICKS ARE JUST HATCHED. Most of the time mother birds will only take the day olds.