Africanized honey bees are not constantly aggressive; they are more defensive on average and much more likely to escalate when they perceive a threat, but they behave like “normal” honey bees much of the time. Africanized colonies ramp up much faster and harder in defense than European colonies once something crosses their threshold. They respond more quickly to alarm pheromone, send out more workers, and will pursue a target farther and longer. Typical triggers include vibrations, noise (mowers

Dangerous Swarms - Africanized bees attack and kill man.

African Killer Bee Hive | Deadly 60 | BBC Earth