Time, y'all. It's just a matter of time. Scientists are involved. If you're using your handy-dandy once-was-fiction-but-not-anymore guides for zombie destruction (hint: double tap and aim for the brain), that's never good. The zombie apocalypse is nigh. Zombie-proof your homes, build your compounds and prepare to hunker down. With lots of ammo.
A tropical fungus has adapted to infect ants and force them to chomp, with surprising specificity, into perfectly located leaves before killing them and taking over their bodies*Thanks to Confessions from Suite 500 for bringing this to my attention.