I've hatched Muscovy eggs under a chicken and since I don't have access to a real incubator, under an incandescent bulb (you gotta watch the temperature, and frankly I've only succeeded with eggs that started out under either a duck or a chicken). My problem is I have dump nests where multiple birds (multiple species) lay. Sometimes one broody hen will want to set before the others have finished laying so I've got different hatch dates. When the first hatch, I finish the others under a lamp. When the broody mother is a chicken hen, rather than a Muscovy hen, she'll take the late duckling hatches with no problem.