Hello from the Canadian Prairies!
I've just joined because I wanted to share a creature that I've only recently learned the existence of: a book scorpion.
Also known as the pseudoscorpion, or false scorpion.
"The book scorpion, (Chelifer cancroides), 4 mm long, occurs in houses and libraries. It feeds on book lice, carpet beetle larvae, clothes moths, and bedbugs."
A pretty useful arachnid to have around the house, no? I can just imagine it in the Great Library, a tiny predator roaming from story to story looking for prey.
One thing the Britannica site got wrong is that they don't just exist in warmer climates. There are three related species living as far north as the Yukon and northern Quebec. (Syarinus obscurus, Wyochernes arcticus, and M. Brunneum)
One scientist believes they could protect beehives from parasitic mites: