Ant

Weeeiird. In my AP Biology textbook from high school, I remember learning and reading about this fungus that attacked ants.  The ants would unwittingly ingest the fungal spores, and the spores would grow, bursting out of the ant, and using the corpse as nourishment.  There was even this picture of the fungus stalk breaking through the dead ant. Thanks to the Internet, I found the same photo online.antfungus

Scientists have discovered a fungus in Thailand that takes over ant brains, and forces them to stay low to the ground, find locations suitable for the fungus, and wait to die there. It literally takes control of their brains. That. Is. Crazy.