Why are African Honey Bees called killer bees?

== == Africanized or Killer bees are different that domesticated or European bees in that they produce greater quantities of honey that is sweeter, and they are much more aggressive for less reason and they produce more and stronger sting venom. Where European bees will defend their hive if intruded upon (the reason beekeepers use smudge pots to anesthetize the bees), Africanized bees will actually pursue intruders and continue to sting him even after he has died, and they may interpret an intruder as no more than a passerby.