What is tracker jacker?

Tracker jacker is a type of genetically modified wasp, created by the Capitol in the Hunger Games book series written by Suzanne Collins. They are used as a weapon in the games to attack the tributes. The tracker jacker venom causes intense pain, hallucinations, and paralysis. It can also induce a state of paranoia and aggression. The venom can be deadly depending on the amount and the person's susceptibility. The tracker jackers are attracted to movement and make their nests in trees. The Capitol can control the tracker jackers with pheromones.