I have some Muscovies who are 2 weeks old (nine of them) and 2 Muscovies who are 6 weeks old. They are in separate pens. Babies are inside a pen inside the coop and the older two are in a tarp covered pen outside. My question is: when can I put the two groups together? I will be keeping them outside in the tarp covered pen together. You know smelly ducks can be and these babies sure are smelling up the coop. I clean my coop daily but don't want the babies outside if they will be pecked on by the older ducklings nor outside if they will be too cold now that the weather has changed and it is in the lower 40's at night now. Neither group has been allowed outside their pen as yet. I also have three four month old Mallards who go to the outside pen to visit the older two Muscovies...not friendly with each other as yet.