https://phys.org/news/2018-05-bumblebees-iridescent.html

Although using bright flashy colours as camouflage may seem counterintuitive, researchers at the Bristol Camo Lab found that intense iridescence obstructs the bumblebee's ability to identify shape.The eyes of bumblebees have been extensively studied by scientists and are very similar to those of other insects.

They can be used as a visual model for predatory insects such as wasps and hornets. When presented with different types of artificial flower targets rewarded with sugar water, the bees learned to recognise which shapes contained the sweet reward.