PAUL D STEWART / SCIENCE PHOTO LIBRARY PAUL D STEWART / SCIENCE PHOTO LIBRARY
Structural colour (non pigment colour) of a blue and yellow macaw feather (Ara ararauna) is created by randomly orientated nanochannels in a spongelike keratin matrix. The reflections are not arranged in the same direction giving them bright but not strongly irridescent colours that do not change with angle.
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