The abundance of four common species of bumblebee in the US has dropped by 96% in just the past few decades, according to the most comprehensive national census of the insects. Scientists said the alarming decline, which could have devastating implications for the pollination of both wild and farmed plants, was likely to be a result of disease and low genetic diversity in bee populations. Bumblebees are important pollinators of wild plants and agricultural crops around the world ... thanks to their large body size, long tongues, and high-frequency buzzing, which helps release pollen from flowers. Sydney Cameron, an entomologist at the University of Illinois, led a team on a three-year study of the changing distribution, genetic diversity and pathogens in eight species of bumblebees in the US. By comparing her results with those in museum records of bee populations, she showed that the relative abundance of four of the sampled species (Bombus occidentalis, B. pensylvanicus, B. affinis and B. terricola) had declined by up to 96% and that their geographic ranges had contracted by 23% to 87%, some within just the past two decades. Cameron's findings reflect similar studies across the world. According to the Centre for Ecology and Hydrology in the UK, three of the 25 British species of bumblebee are already extinct and half of the remainder have shown serious declines, often up to 70%, since around the 1970s. Last year, scientists inaugurated a 10m programme, called the Insect Pollinators Initiative, to look at the reasons behind the devastation in the insect population.