http://www.heraldtribune.com/apps/pbcs.dll/article?AID=/20041110/NEWS/411100528/1060 Like "Apache helicopters," Santana said, the flies hover over fire ants, waiting to drop down and inject them with an egg that will eventually knock an ant's head off. Fire ants become so terrified of the hovering flies that they become paralyzed, breaking down the structure of their highly organized nests. Two years ago, Santana unleashed a pack of phorid flies on mounds of fire ants near Bee Ridge Road. Those tiny flies, which had an average life span of just 30 days, are long gone, but their offspring have been spotted miles away, hunting down red ants. A fly's injected egg grows in the thorax of its ant victim. Within two weeks, the larva moves into the ant's head, eventually munching it hollow until it drops off. The decapitated head becomes a protective capsule for the larva, which emerges a couple of weeks later as an adult fly, ready to inject eggs into more prey.