"Bumble bees sometimes use old mouse nests for their homes according to what I've read. It seems doubtful those have been sterilized before the bumble bees moved in." That's true, my last call for swarm removal in Morro Bay CA. was a bumble bee hive in an old bird nest. They shared it with several other animals, including wax worms, of all things. I still can't believe the mentality of people who will pay me 50 bucks to get rid of something so interesting and so beneficial and so harmless, but there you go. :::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::: -- Visit www.honeybeeworld.com/BEE-L for rules, FAQ and other info --- ::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::::