Africanized honeybees, known as killer bees because of their swarming, aggressive and deadly nature when a colony is threatened, have made their way to the San Francisco Bay Area for the first time, researchers say.
The bees have been spotted in Lafayette near Briones Regional Park by UC San Diego researchers who have been tracking their movement in the state, the San Francisco Chronicle reported (http://bit.ly/1iI0RTq) Tuesday.
The bees had previously been seen only as far north as Mariposa County.
Joshua Kohn, a professor of biology at UC San Diego, said it is hard to tell at this point how many of the bees are in the San Francisco area.
"The sampling is a little sparse up north," he told the newspaper. "But there is most likely more than one colony," he said.