Why does the indigo bunting (Passerina cyanea) look so blue? It isn’t from the color of his feathers. In dull light he looks gray!
Last month when I wrote about blue morpho butterflies I learned that their color comes not from pigments but from the structures of their scales that reflect blue light.
This same color trick is what makes indigo buntings’ feathers so blue.
Watch the Deep Look video below to learn how it works.
(photo of indigo bunting by Marcy Cunkelman, video from Deep Look on YouTube)