Following is a transcript of the video. Narrator: At first glance, a fire ant hill — or mound, as it's properly called — looks impossibly small. And yet, a colony of up to 250,000 ants call it ...

Hybrid fire ants are extremely aggressive and tend to swarm when their mound has been disturbed. Pheromones released by the ants quickly alert colony members to the threat, leading to a mass ...