Africanized bees, also known as killer bees, are hybrids of the African honeybee with various European honeybees descended from 26 Tanzanian queen bees accidentally released in 1957 in Southern Brazil from hives operated by biologist Warwick E.
See also:
Kerr, who had interbred European honeybees and bees from southern Africa.
Hives containing these particular queens were noted to be especially defensive..
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