Ophiocordyceps unilateralis
Ophiocordyceps unilateralis, commonly known as zombie-ant fungus, is an insect-pathogenic fungus, discovered by the British naturalist Alfred Russel Wallace in 1859. Zombie ants, infected by the Ophiocordyceps unilateralis fungus, are predominantly found in tropical rainforests.
Source: Wikipedia — Ophiocordyceps unilateralis (CC BY-SA 4.0)