The strangest thing happened this spring. Both of our hives of honeybees, which had survived the extreme cold this past winter (it got down to 9 degrees F, the coldest it's ever been here), died when spring came. I think their numbers just grew too small to keep warm with our cold weather in the spring. After discovering that the first hive of bees had died, we went into the second hive, which seemed like it was still going. But, what I discovered in the second hive was a dead cluster of the original bees surrounding the lower frames and a new cluster of living bees in the top box of the hive. The cluster of living bees in the top of the hive look different from the original bees. They are slightly darker, larger, and more robust-looking. I think they moved in during warmer weather in the middle of spring. I believe they were actually robbing the other hive, too, as the first hive was empty of honey but had bees coming in and out when we discovered the dead colony inside. The reaso...