The Muscovy females here all fly. Sometimes they fly two or three kilometers and come back. Like the OP, I love to watch them fly and twice now to my knowledge they have flown to the safety of the house roof when a dog attacked. It's just unfortunate that on one occasion one of the males who are too heavy to take flight properly got killed.I clip my Muscovy females wings to keep them safe they are on a little over half acre fenced in during the day locked up at night my oldest is going on 12 in a few months I doubt I’d still have her if I hadn’t clipped.