We had our 3rd bee swarm of the week today. I am baffled as to why the bees are swarming so often and so late. I hope there are enough drones around to fertilize the new queens. It's all very well swarming - the existing queen leaves with a significant proportion of the worker bees - but if the new queen left behind can't be mated, the colony will simply die out. Fingers crossed that there are plenty of sex starved drones around looking for virgin queens.