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Africanized Honey Bees
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Africanized Honey Bees

Africanized honey bees (the so-called "killer bees") arrived in Arizona in 1993. Some colonies of Africanized honey bees defend their nests with more vigor and in greater numbers than the common European honey bee. When bees defend their colonies, they target furry and dark-colored objects that resemble their natural enemies: bears and skunks. Therefore your pets are likely to be stung when bees are disturbed. Animals that are penned or tied up near honey bees are in special peril.

About Africanized and European honey bees:
Honey bees are about 5/8-inch long, brown, hairy insects with black encircling their abdomen, giving them a subtle striped appearance. All honey bees look alike. Only an expert can tell them apart.
The sting from a single Africanized honey bee is no more harmful than one form the common garden or European honey bee. Africanized honey bees are known as the so-called "killer bees" because they defend their nests more readily (with less provocation), and in larger numbers than the European honey bee, so there is a greater chance of receiving many stings.