To cold for the pigeons to fly...

The past couple of days I've been working in downtown Ottawa allowing me to see things I normally wouldn't notice. This morning it was a crisp -21C/-5F and sunny. As I was getting off the bus, I noticed something about a gaggles of pigeons. It was to cold for them to fly. They were all perched next to a exhaust heating duct from a nearby parking garage. They were extremely reluctant to move. I was bundled up in winter clothing but less than I have been in the past. My REI down jacket allowed me to drop a layer of clothing, my Polar fleece 300 jacket which I normally wear as a base layer. In its place, I'm wearing a Polar fleece 200 weight vest. On top, I wear a Mountain hardware toque and on my hands I wear a Mountain hardware primaloft gloves. Tomorrow, I head south to warmer weather and hopefully little or no snow.