We all know that nature is full of horrors, and we've all seen When Nature Attacks to confirm that animals can easily take out a human with a flurry of hoof blows.
And then there are those animals that don't need brawn to get the job done, those amazingly adaptive animals who learn to protect themselves in the most terrifying ways.
These critters lurk around just waiting for someone, or something, to mess with them so they can show off their amazing adaptations and scare the fur or feathers off a would-be predator.
Some, like the Horror Frog, actually cause themselves harm when in defensive mode:
Others, like the bravely defiant Fulmar, have learned to spit in a predator's face to avoid becoming a Fulmar McNugget, using their own special sauce to make that predator lose its appetite:
See the 17 Things In Nature That Just Shouldn't Exist Because They're Terrifying here (Some entries contain NSFW language)