Scientists say the bees' temperament is to ward off predators. But unsuspecting humans will find them to be aggressive, spiteful and terrifying.

Killer bees are spreading across the US – and are being drawn to northern states because of warming temps - Africanized "killer bees" are spreading across 13 southern US states, with their northward migration driven by climate change.

Highly aggressive Africanized honey bees, the so-called "killer bees," are moving north and spreading as climate change expands their environments.