Here is a prime example of my father‘s favorite kind of temperature gauge. I photographed this red shouldered hawk yesterday morning when the wind chill factor was 35°F. Even if I had been sitting in my warm truck, I could have glanced over at this hawk and known that because he is almost as big around as he is tall … the air is cold. He has all of his feathers fluffed up as a nice warm blanket. Also note that he’s got his body lowered so that his feather blanket is mostly covering his feet … just like our warm winter slippers would do.