To Find Nectar, Bees Follow Blue Halos

Subtle halos on flowers function as bright blue landing pads for bees.

Tiny ridges on flowers, visible only at the nanoscale, serve to reflect blue and ultraviolet light that draws in pollinators. To bees, it appears as a ring around the flower’s center, and lets them and other insects immediately differentiate between a nourishing plant and a dead end. The trait seems to have appeared many times throughout the evolution of flowers, and likely dates back to the emergence of pollinators so

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