Tests on a type of cabbage species called field mustard, a close relative of oilseed rape, showed that when pollinated by bumblebees, the plants grew three inches taller than with hover flies in just nine generations.

They also flowered a day earlier and had double the fragrance. And when placed on ultraviolet light, they had more colours which bees can see.

— Another reason to worry about bees, in case you didn't have enough already. Read more at Bumblebees make flowers grow bigger and smell sweeter at The Telegraph.