When I was a kid I spent a summer with an old couple that were friends of my parents who raised thousands of pet store birds commercially. They also had just about every kind of exotic chicken imaginable, including some bantys that often got broody and would be used to hatch eggs from other chickens as well as ducks, turkeys, chukars, quail, geese, etc. I remember seeing so darn many eggs under them, wondering how in the world they could handle so many, but they all would hatch. They haven't invented an incubator yet that can compare to an old broody hen!