Picture shows a bumblebee, undated. Chemical substances have an even worse impact on the behaviour of bumblebees at high temperatures, according to studies at a renowned British institution. (Daniel Kenna/Imperial College London, NewsX/Bee)
Picture shows Prof Dr Randolf Menzel from the Free University of Berlin, Germany, undated. He has researched the western honeybee's behaviour for more than 50 years. (NewsX/Bee)