Do they have vinegaroons in Japan?
Edit: Nevermind, there are Asian Vinegaroons.
You shoulg get one of those and throw them in the cage. They'll tear anything to bits, I've seen it happen. If you do happen to find and catch one, be careful. They're dangerous.
I wouldn't worry about the one on the bottom, as it is a Mexican Whip Scorpion.
"
Vinegaroons, or whip scorpions, are venomless arachnids that release an acetic acid substance when molested. This is the same type of acid as vinegar, hence the name. They do not bite, so please quit spreading this silly vicious rumor about a harmless, though somewhat frightening looking relative of spiders and scorpions." - Whatsthatbug.com
release an acetic acid substance when molested.
Best. Quote. Ever.