On Wednesday, I experienced a somewhat peculiar encounter: In the library for German language and literature studies in Vienna, there was a dead mouse. Probably she's in mouse heaven now, watching "Tom & Jerry" or reading "Of mice and men". At first, I thought the waitress must have put something in my morning coffee and I'm hallucinating. But the librarian confirmed that poison baits were spread out in the library.
I would have suggested a library cat instead. There really is a "library cats map" which lists over five-hundred "Total Known Library Cats"!