One of my 2 hives seemed to swarm yesterday, I got a call from my wife about midday to say there were bees everywhere and a big cluster 30ft up a tree. One hour later when I got home there was a beard over the front of one hive, everyone was fanning madly and the girls were busy marching in, so buggered if I know what's going on. Anyone had their bees re-hive themselves?