In 1993, the first lab test was released in Arizona confirming a bee involved in a fatal on attack on a small dog at a Tucson home was an Africanized honey bee. Because of their more intense defensive swarming behaviour, such non-native bees earned the name "killer bee" in the media. Arizona was the second state to be invaded, less than three years after this species spread north into Texas from Mexico. Since the fifties, the bees had extended their range northward through Central America. Their original source was from cross-breeding with tropical African bees imported into Brazil for experimental work. more