I hatched out three Mules in May.  Two Drakes and one Hen.  I kept the Hen and rehomed the Drakes.  They were all huge!!!  I had a Rouen Hen and a Huge Muscovy Drake mate.  The male was over 15 pounds and he also has been rehomed.  Two of the eggs were incubated in a cheap incubator that took 35 days to hatch.  The other one was under a Mallard Duck and once her babies hatched out she abandoned it.  I brought it in and used a lightbulb in a styrofoam cooler with a cup of water and a temperature gage in it.  It took another week and could not get out of its shell so I peeled it out after making a hole in the egg so that it could breathe.  It was all sticky and gooey so I washed it off,   put in under a lightbulb in an aquarium until it was bigger,  then it a tote,  then with the other two that had hatched out.  They were soooo pretty.  First with their Rouen looking heads,  then the bodies turned a real pretty lavender.  Then a Gray barred body with a Rouen head.  That is how my one named Lucky looks to this day.  I know this is an old post,  I just wanted to share about my mules.  Hopefully she will lay eggs.  Some sites say they can and some say they cannot.  I eat the eggs.  I know they will be sterile but I don't care about that.