I bought 6 muscovie duckings a few weeks ago. They are between 3-4 weeks old now. I have them in a pen in the garage with a 125w heat lamp bulb in a corner of their pen. I turn it off on warm days but keep it on at night. The days here in NE Wisconsin vary from 65-80 degrees. The nights now are 35-50 degrees. I'm used to brooding duck/chicks in the spring when the days keep getting longer and warmer. Not in the fall when it is the opposite. I'm guessing they need the heat light for another 2-3 weeks, or should I wait until they are feathered out to move them to the outside duck pen?