"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.

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