With having the chickens and the rabbits I had to go and check on them every few hours. My three Rouens were always out in the yard in the snow. I was more worried that they were frozen in place. Had to go shoo them every 4 hours or so into their house. I have had a Pekin years ago get frozen in place for a few days before I realized his foot was frozen in place.
Aww that stinks!! Silly birds u would think they would stay in the house were its a little warmer!