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Ophiocordyceps unilateralis erupting from a forest ant.

Here Are Some Upsetting Parasites

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The world is filled with disturbing creatures that slither, crawl, and scuttle. But few things are more dreadful to the imagination than the animals, fungi, and other assorted organisms whose sole purpose in life is to invade and feed off the lives of others. Here are some of the creepiest parasites in the animal kingdom.