When checking my two overwintered hives (in very cold Minn), I found one completely dead. A good cluster of bees centered in the back half of the 8 frame mediums I use. They had eaten all the honey in the back halves of the boxes and not touched the front halves. There were at least three half mediums (12 frames) of capped honey left untouched. The bees appeared in good condition (except being dead!). The bees were alive (by sound) up until a week of extremely cold weather in Feb. (no sound after that). I overwintered with six 8 frame mediums of bees and honey, wrapped hive, moisture board, fed in the fall. The other hive was set up exactly the same. They have a large active cluster in the middle and two frames of honey on each end left.
This is my 1st overwintering of bees. With nearly identical hives, any ideas what happened to this one? Would losing a queen or some such thing cause this- or just bees being bees?