News From Your Present: The Parasitic Flies That Turn Fire Ants Into Zombies

The flies “dive-bomb” the fire ants and lay eggs. The maggot that hatches inside the ant eats away at the brain, and the ant starts exhibiting what some might say is zombie-like behavior.

… and then …

The maggot eventually migrates into the ant’s head, but Plowes said he “wouldn’t use the word ‘control’ to describe what is happening. There is no brain left in the ant, and the ant just starts wandering aimlessly. This wandering stage goes on for about two weeks.”