Help, I’ve Lost My Butt!

We are thankful that this video on disappearing anuses has nothing to do with humans. It's those other weird species that suffer butt loss. SciShow starts with lizards and scorpions, who can shed their tails to avoid predators in an emergency. But that means losing their anuses, and then they can't poop. Logic tells us that when you remove a hole, you still have a hole, especially in a system that goes through the whole body. Apparently that doesn't mean anything to an anus-less scorpion, who must hurry up and have sex because they are going to die of constipation. But that's just the beginning of a parade of animals losing their butts. There are sea spiders, jellyfish, annelid worms, and cicadas. In the latter case, a fungus causes the cicada's butts to fall off, but they don't care because the fungus gives them drugs. Nature is brutal.