The scorpion is hands-down the most predictable fighter in the creepy-crawly thing world. We get it already---you have a tail. Your tail stings things. Sometimes, poison is delivered. I'm not even so much impressed by the stag beetle as unimpressed by what's basically the combination of a lobster and a wasp that can't fly.
But scorpion cruelty=MEGA WIN. Those things are evil and disgusting and watching one get its shit just totally taken apart has made this my new favorite video. It's also made stag beetles my new favorite bug.
I almost docked this a star for not having them fight among (and crush) very small models of buildings. You can't even pretend that wouldn't be the greatest of things.