Depends on the time of year for ours. If it's early they will ditch their first hatch pretty much once they are about half feathered or a little more to go start another nest. They usually group back up with them at night though. Right now I have 2 mamas who hatched within 2 days of eachother and decided to join up and co-mother. They won't be making another go at a hatch this year I'm sure so they are still with their babies. All our muscovies are free range, I don't know if that makes a difference.