Copperheads were very common here, less so now that more people have moved into the subdivision. My yard is sort of an oasis for them . E. TX is expecting record cold in spite of climate change so I was covering a few things; damn ground orchids are already blooming. I let the camellias take care of themselves; there are too many to cover. I lifted a large plastic tub that was inverted on the ground , a smallish ,dormant copperhead fell out on the leaf covered ground. He did not move so I built a well insulated enclosure over him ( with an exit). Temp is now 40 F but 30 is expected tonight and mid 20's the next two nights. I am wondering at his chances of survival ; I estimate his body temperature will get to mid 30's F. I had thought they went deep into animal boroughs; we have many voles and some moles ( because there are not enough copperheads left to keep them under control). I have a well insulated garden shed that will probably not go below 50 F but I don't want to move him unless it is an emergency.