This bear den was recently discovered.  The day after the video was made all three bears from the den were in a tall pine tree despite a temperature of -20 F. The den is near several fish houses. Can you imagine the surprise an ice fisherman would have if he opened the door to face a mother bear and its cubs? I hope there is peaceful co-existence until spring when the bears will have more food. Bears do not truely hibernate and can be active throughout the winter.