There's a fungus that turns ants into "zombies" - Apparently.
Ophiocordyceps unilateralis, a fungus, infects carpenter ants in the rainforests of South America, eventually killing them. But before it does, the fungus manipulates the ant's behavior, causing it to climb to a high location and bite onto a leaf, creating a perfect environment for the fungus to produce fruiting bodies and spread its spores. This fungus essentially turns the ants into "zombies" to ensure its own survival.