The colder it is, the bolder the deer become about getting food.
This guy is cleaning out the bird feeder, virtually unconcerned that I am standing behind a glass wall five feet away snapping pictures and firing my flash. His stalwart example has just drawn two more of his brethren to the trough. I guess I can't blame them tho. It's about 0 degrees F with a windchill in the minus teens and the deer are having a hard time walking on the crust of the "bulletproof" snow that is left. It's a 'get it when you can' world for them.