Bees recognize human faces

Scientists have demonstrated that honeybees can recognize human faces, sometimes for days. Adrian Dyer of the University of Cambridge and his colleagues trained the bees to associate photographs of particular human faces with a sugary treat. Later, five bees were able to pick out the right face from a group of others. The results of the study, reported in the Journal of Experimental Biology, may eventually aid the development of computer vision systems. From World Science:

“Two bees tested two days after the initial training retained the information in long-term memory,” they wrote. One scored about 94 percent on the first day and 79 percent two days later; the second bee’s score dropped from about 87 to 76 percent during the same time frame.

The researchers also checked whether bees performed better for faces that humans judged as being more different. This seemed to be the case, they found, but the result didn’t reach statistical significance.

The bees probably don’t understand what a human face is, Dyer said in an email. “To the bees the faces were spatial patterns (or strange looking flowers),” he added...

Dyer said that if bees can learn to recognize humans in photos, then they reasonably might also be able to recognize real-life faces. On the other hand, he remarked, this probably isn’t the explanation for an adage popular in some parts of the world—that you shouldn’t kill a bee because its nestmates will remember and come after you.

Francis Ratnieks of Sheffield University in Sheffield, U.K., says that apparent bee revenge attacks of this sort actually occur because a torn-off stinger releases chemicals that signal alarm to nearby hivemates. Says Dyer, “bees don’t normally go around looking at faces.”

Link to World Science article, Link to abstract in Journal of Experimental Biology