The Killer Gigantic Centipedes are IMHO some of the creepiest characters to appear in a Star Wars film, in no small part because they are based on the creepiest characters in real life.
Real, everyday centipedes drain their prey of blood. They are born looking like adult centipedes, only smaller. And they hunt in packs, just like velociraptors. No movie monster can really match that in pure scariness terms, but these things come close.
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