So I have three Buttonquail and I’m planning to keep them in a 50 gallon bin. The bin will be kept on the covered back porch but it gets pretty cold in the winter, down into the 30’s. How do y’all keep yours warm? I have a heat lamp, but I don’t know if I can get it close enough to them. Could I use a heat mat or plate?Of course if it gets too cold I can bring them in for the night, but I would like them to be outside for most of the winter.TIA!