Africanizedhoneybees, known colloquially as "killer bees, " are believed to have entered Texas in 1990 and have since spread to at least 10 other states, from California to Florida.
Africanizedhoneybees, which are hybrids of African and European bees, can be highly defensive around their nests and swarm more frequently than other honeybees, according to the U.S. Department of Agriculture.