Ours are all 'outdoors' 100% there not being a fox problem here due to lots of gamekeepers in the area. Muscovies learn to fly around 12 weeks (girls fly first being lighter) but they don't fly away. We have a large mill pond so its impossible for us to put them to bed - but Muscovies roost on window boxes, roofs, fences etc and that keeps them safe. We had KCs and runners when we first came here and they were all taken by otter of all things (dog otters are huge) so now we only keep Muscovies because they survive here. They do love to swim and like a good dunk when washing. I don't wing clip because we don't have to for one thing but it's their only chance to get away if threatened. They are serial broodies bringing up their young very well until around 6-8 weeks old then having a couple of weeks holiday and back on the nest. We can't get to ours because they have taken to nesting underneath a building here by the river in some nice sandy soil. We'll have to put chicken wire round the base to keep them out but can't do that until they are all out which isn't going to happen until the end of the year. Beautiful ducks though and lovely nature, very calm, eat out of your hand.