I just picked up five Swedish ducklings one of which is pretty small and the others are larger but still getting feathered out. They are all outside together in a run but I was wondering how much heat they, especially the tiny one which is probably only a week or so old, are gong to need at night. We are expecting temps in the mid 50's for nighttime lows all week. I was thinking of putting them in the rabbit hutch for the night puting a heat light in there. Is that needed or will they just cuddle?