Nature makes some freaky stuff. For example, there's a parasite that can hijack its host's brain and drive it like a car, and there's a whirlpool so big and scary that people have been writing about it in literature for centuries

As it turns out, not everything cute in the animal kingdom is cute from head to toe. For example, do you like penguins? Well, you wouldn't like sticking your finger in a penguin's mouth, that's for sure. 

(I don't recommend trying it.)

Open wide! 10 really creepy animal mouths.

We all knew geese were bitey jerks already, though.