Science fiction often has monsters, and we know there are no monsters in real life. Or sure there are sharks that might make a meal out of you. And tigers. And wild boars that could open up your innards. And hippos. And crocodiles. But other than that, no monsters, nope, none at all.
Seriously though, there are creatures like parasitic wasps that lay their eggs inside a catepillar. The catepillar just lays there, unable to move as wasps consume it from the inside. That's as horrifying a thought as any monster from science fiction.
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