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The threat posed to man with the potential loss of the honeybee illustrates how vulnerable the lack of biodiversity makes us. The bee issue has prompted some to ask the question, why are we so dependent on just one insect species for our pollination needs in the first place? Last year the US lost a quarter of its bee population, and this year similar losses are already being seen. Living Planet visits bee researchers in Berlin at the Free University zoological department to find out more about the mystery.