I’m sitting at my window, looking out. It’s minus 10 Celsius out (windchill -15C), and there are about 10 little sparrows chirping away outside my window (in the shade). Same with seagulls, and pigeons.
How are these little guys able to survive the cold? They’re out there all day in this temp. How can They possibly be able to produce enough heat in their little bodies to stay even above freezing – let alone be 30 degrees (or whatever their normal body temp should be). …And at night it gets even colder!
How the heck do birds do it?? Even with a thick coat I’d be dead in 24 hrs!