Hi Cuckoo, I breed Muscovy ducks - we never clip their wings and they have never flown away, we have around 21 at the moment and they are all happy to stay around and eat the goat mix on top of their cut maize. We never shut them in - they roost on fences, shed roofs and dead trees which is much better and safer than shutting them in - don't shut them in. The females fly before the males - you should be able to tell the males from their size from around 10 weeks - they grow carbuncle type things on their face and aren't terribly attractive. The females are fab mums and - sorry fleecwife - we've only had 3 males this year and 14 females, all of which have survived. We have a few serial sitters and they are very friendly eating from our hands and jumping on the window sill for bread treats.
Jaykay - we did have to get rid of our original male though because he started attacking those expensive female geese you sold me

- seemingly they don't tolerate females of a different species very well. Our more recent drake was born here and he and the geese/gander seem to tolerate each other well enough.
Cuckoo - we have had runners and various campbells in the past but I love Muscovy ducks for their wonderful temperament and great mum skills. Great ducks, enjoy.