Honey bee colonies around the United States are in decline, threatened by several different diseases and parasites. John Hafernik, a professor of biology at San Francisco State University, describes how a parasitic fly that was thought to prey upon bumblebees may pose a new threat to honey bee populations in the U.S.
Source: http://www.npr.org/2012/01/06/144794041/parasitic-fly-threatens-honey-bee-populations?ft=1&f=1007
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