The horses later died from "thousands" of stings, their owner said. Scientists say the bees' temperament is a defense mechanism to ward off predators – and note that because honey bees die after stinging,

Most of the bees in Arizona are Africanized "killer" bees. Here's what happens if you get stung by a killer bee and how to get rid of them.

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