Bumblebees are less able to start colonies when exposed to a common neonicotinoid pesticide, which could lead to collapses in wild bee populations, according to new research published in Nature Ecology & Evolution. Researchers from Royal Holloway, University of London, and the University of Guelph have found that exposure to thiamethoxam, a common pesticide, reduced the chances of a bumblebee queen starting a new colony by more than a quarter.