I have had my Muscovy ducklings since they were 3 days old. They were kept in the garage with no heat but it was warm here so they did fine. At two weeks I moved them outside here in Ohio where they could see my other ducks. Today at five weeks when one of them is almost fully feathered and huge and the other one smaller but some feathering I added them to my flock. I did not know what to expect but everyone was great. I was soooooo happy that they all get along so well even though I know they do not speak the same language. I have 2 Rouen Mallard mixed drakes, 2 Rouen Hens, 7 Mallard Hens and the two Muscovy ducklings that are now 5 weeks old. It was a happy day for me and my flock of ducks that I love.