There is Leucochloridium, which controls snails (it eats its eye and then forces them to climb up to get eaten by bird). Or worm Spinochordodes, which forces grasshopper to drown in order to get into water. Or fungus Ophiocordyceps, which creates zombie ant.
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Did you know sharks are older than dinosaurs? I think jellyfish are even older, some 1.8 billion years or so
I did know that!