Yeah, my family calls 'em mud divers.

Interesting. "Divers" is probably a corruption of "daubers." Do all Scots call em that or just your family?

I've witnessed many turf wars between the local crawdads and the mud diver population

That's funny :P

Crawdads tend to vacate their holes if mud divers try to move in while they are away.

I don't blame em... I vacate my bedroom every time a wasp shows up! (Which, living in Dixie, is much more common than I'd like it to be.)

They get into our house a lot through our windows, and they've never done a damned thing to me.

Yeah, that's the experience I tend to have. They ain't aggressive, and only sting in self-defense.

I hate wasps though. I will kill a wasp.

Dirt daubers are wasps, though! They're just a more docile breed than, say, red paper wasps — which are the spawn of Satan and will hunt you down. I don't think they're found in Europe, but they're the most common type of wasp in Dixie (at least from my experience).