Africanized honey bees (Apis mellifera), also famously referred to and exaggerated as the “killer bee”, was introduced into Brazil in the 1950’s to increase the production of honey.
In 1990 a localized population was identified in Texas, showing that the bees had gradually expanded their range into Central America and onward into North America. The Africanized bees are actually products of hybridization which resulted from attempts to crossbreed the African honey bee with a variety of European honey bees.
In the later 1950’s, 20+ swarms escaped quarantine and subsequently made its way to North America. After their observed arrival in 1985, they quickly became established and began spreading into adjacent southern states, both west and east.
Due to the rapid - natural dispersal and establishment of the bees, which was most notably, un-assisted by human activities, has led to them being labeled as the most biologically successful invasive species to date.