Bumblebees exposed to a widely-used pesticide produced workers with lower body mass, scientists theguardian.com, Monday 20 January 2014 10.01 GMT Bumblebees could be shrinking because of exposure to a widely-used pesticide, a study suggests. Photograph: Nick Ansell/PA Bumblebees could be shrinking because of exposure to a widely-used pesticide, a study suggests. Experts fear smaller bees will …