oh dear, are my under tail coverts showing???

not really but this titmouse surely was fluffed out in the  minus 6 degree weather we had early this AM . It was up to a toasty 13 degrees F when I took this.Another common feeder bird . I usually see one or two of these at a time but this Am there were 3 at the feeders at the same time. One was out there at dusk in the suet getting ready for tonights temps , though they are rising overnight.