This undated handout photo provided by credit David Goulson, Stirling University shows a bumblebee nest. A common class of pesticide is causing problems for both honeybees and wild bumblebees, important species already in trouble, say two new scientific studies. The new research suggests the chemicals designed to attack the central nervous system of pests also reduce the weight and number of queens in bumblebee hives and that they cause more honeybees to become disoriented and fail to return to their hives. (AP Photo/David Goulson, Stirling University)
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