CD, I'll bet you get lots of stinging responses to your post...

It can be more than just hornets. I have done projects where the first order of business was to clean up a mouse-infested line shack so that we woulld have a place out of the weather to cook and work. It wasn't a trivial task - until we tried to use the oved, we did not realize that the space beneath the broiler pan had been a mousie condo!

Lots of nasty critters like to shack up in old, disused abodes.