We had the coldest night we have had this year last night, we got below zero wind chills. I had some 6 week old coturnix that have been outside since 4 weeks old, they have a 250 watt heat light above them but they are in a 1/2" wire cage so it is drafty around it. They are in a 6x8 metal shed and the cages are hanging on the side walls inside, with the heat light on it usually stays warm enough in there that the water bottles on the 6 different cages with various aged quail didnt even freeze but last night was too much. My older birds are ok but I found 2 of my 6 week old quail dead this afternoon, I didnt check on them before leaving for work this morning but I am assuming they died overnight with the -10 wind chills. Since my older birds are far away from the heat light and they are fine I am guessing the young ones are just not big enough to get to temps that low. I made sure I have been giving them plenty of feed, bird food mixed in, and even ground corn for body heat but obviously that doesnt fix every issue. I was a little upset about it but I shook it off, I came inside to check on my 3 to 5 week old quail and I found one of them dead in the dang water bowl, sad day at my house but I will recover ( by hatching out 100 quail to replace them lol ) Hope you all are doing well if the temps are low where you are too, make sure your babies have plenty of food to keep their bellies warm and enough water that is not frozen.