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I dont want to exterminate them Chris, but apparently, living in the walls they can cause an untold amount of damage- especially if there are a large number of them. Also, with the wall they are in being in an open street, its possible (so I have read on the 'net) that when they have honey & young bees they will become protective of their hive & may swarm & sting. If they can be removed without extermination-thats what I'll have done.