this is kinda freaky.
"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."

http://news.yahoo.com/s/mcclatchy/20090512/sc_mcclatchy/3231765

This is happening right here in Austin! I'll need to get some to help subdue our fire ant problem in the yard. They are crazy mean!