Nanoscale glitches let flowers make a blue blur that bees can see

Imperfectly spaced petal ridges weaken iridescence — but that’s all good

halo flower

BLUE HALO  Bees can easily learn to recognize a bluish tinge called a blue halo created by sloppy nanoscale structures (located in the dark center circle, and seen at right) on such flowers as Ursinia speciosa

E. Moyroud et al/Nature 2017

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