I came across this earlier, Zombie Ant! Below is the articles :'Zombie ants' may sound like the title of an Ed Wood movie, but, according to National Geographic, they are quite real.
Oddly, there's nothing very zombie-like about the actual ants. It's only when a particular fungus takes over the ant's brain that things get weird.
Once the "stalk of the newfound fungus species Ophiocordyceps camponoti-balzani infects an ant, the ant gives up control over its own body. After the fungus is in control, it forces the ant to scamper toward "a location ideal for the fungi to grow and spread their spores." Then, it's lights out for the ant. Who knew a fungus could be so diabolical?
These wild discoveries were made by a group in Brazil headed by entomologist David Hughes. National Geographic published a series of pictures of ants that have "lost their minds" to the fungus.