You've seen this in many movies--parasites that take over people's minds and bodies and force them to do their bidding.  Well, that stuff of science fiction actually has a basis in fact.  Carpenter ants carry a parasite that turns them into zombies, and as they die, the parasite, known as Ophiocordyceps unilateralis, forces them to bite the underside of leaves and attach themselves to them.  The parasite then grows a stalk from the ants' heads which release spores that infect other ants.  Scientists have recently found proof that this has been going on for a long time.  They found fossilized leaves with similar marks that date back 48 million years, showing that zombies in nature preceded those in movies by a long time.