Chickadees are simply amazing. They do not migrate but stay north for the winter; at forty, fifty, even sixty below, they not only survive but seem to be happy, fluffed up to stay insulated and warm, and tough beyond belief. I would find frozen grouse; frozen deer standing dead, leaning against trees; frozen rabbits; and two times, even frozen men- all killed by nature, by cold, by starvation or by blatant stupidity.
But I never found a dead chickadee. They are like little feathered wolves, except more versatile.
(Gary Paulsen- Guts)