I know this is a serious subject if you live in the northern regions of the US or in Canada, but just had to insert a bit of humor: I live about 3 miles from the Red River in Oklahoma and we aren't exactly a cold temperature location, but the the artic front that came through day before yesterday dropped our temperature down to about 20*. The water bucket is outside on the south side of the coop and has had ice in it both mornings. This morning the hens were all gathered around the bucket pecking at the nipples. When I went to check, I found ONE of the three nipples was frozen and the hens were all taking turns pecking at the frozen nipple! Silly things! The others were working fine, of course. I just get such a kick out of the funny things they do!
