My ducklings are about 4 weeks old, they have there pin feathers peeking out from their baby fluff, my husband and I build a pen for them where one side is enclosed and the other is open with chicken wire around it. We close them in at night with the heat lamp, well this morning it's 44 outside and they waddled out of there warm area inside. So I guess my question is will they go in to the heat if they start getting cold? Or will they just sit outside and freeze? Cause if they are going to do that I will pen then in the warm part of the enclosure. Thanks!