Diffraction explains how ridges in the surface layers of their feathers give them color.
Work Step by Step
At the bottom of page 551, it is explained that the tiny grooves of the feathers act as diffraction gratings.
You can help us out by revising, improving and updating this answer.Update this answer
After you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.