What is "africanized bee"

Africanized honey bees (also spelled Africanised honey bees), known colloquially as "killer bees", are a hybrid of the Western honey bee species (Apis mellifera), produced originally by cross-breeding of the African honey bee (A. m. scutellata), with various European honey bees such as the Italian bee A. m. ligustica and the Iberian bee A. m. iberiensis.

The Africanized honey bee was first introduced to Brazil in the 1950s in an effort to increase honey production; but, in 1957, 26 swarms accidentally escaped quarantine. Since then, the species has spread throughout South America, and arrived in North America in 1985. Hives were found in south Texas of the United States in 1990. This species was discovered to have spread into the American Northwest in 2011.

Africanized bees are more aggressive, and react to disturbances faster than European honey bees. They can chase a person a quarter of a mile (400 m); they have killed some 1,000 humans, with victims receiving ten times more stings than from European honey bees. They have also killed horses and other animals.