Bees prefer food containing neonicotinoid pesticides, research suggests.
They may "get a buzz" from the nicotine-like chemicals in the same way smokers crave cigarettes, according to scientists at Newcastle University.
The experiments raise the question of whether bees can be exposed to harmful doses of pesticides because they are attracted to the chemicals.
Another study found neonicotinoids had a negative effect on bees in the wild.
The Crop Protection Association, which represents pesticide producers, questioned the findings of the studies, published in the journal, Nature.