I have two Khaki Campbell ducks. They was born Dec 29 (so around 6 weeks old?) I've been keeping them in the house and they're about fully feathered. I live in NC and the temps fluctuate constantly.. It's pretty cold at night(27°) Could they start staying outside now? Curious since it's only the two of them. I need the big grow out box for my 4 Pekin babies who are growing SO fast!! Thanks Y'all!!