Flatworms are what are known as obligate endoparasites. They live inside of the host, entering the body through the ingestion of larvae or eggs. They are not creatures that go around attacking people.[Dana Scully]Well, that’s good. I didn’t want to have to tell Skinner that his murder suspect was a giant, blood-sucking worm.[Fox Mulder]
Source:S2.Ep2: The Host
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