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First, the so-called 'killer bee' -- more properly called the Africanized honey bee -- is not the result of an experiment that went wrong.

The European honey bee is not at its best in tropical conditions and during the 1950s research was started to find a hybrid that would be better suited to the heat. In 1957, in south-east Brazil, 26 Tanzanian honey bee queens (apis mellifera scutellata) accidentally escaped from a research project and mated with local drones. Their offspring have now spread as far as the southern United States and south to the edge of tropical South America. They do not tolerate cold weather well, and this will probably be the limiting factor to further spread.

The name 'killer bee' was invented by sensationalist media because they are more defensive than the European honey bee and are more liable to sting. However a sting from an individual Africanized bee is no worse than a sting from a European bee.

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15y ago
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Q: When did they do an experiment on bees causing to killer bees?
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