The male peacock tail contains spectacular beauty because of the brilliant, iridescent, diversified, colorful eye patterns. Researchers found that the feathers' bright colors are produced not by
pigments, but rather by tiny, intricate two-dimensional crystal-like
structures. Slight alterations in the spacing of these microscopic
structures cause different wavelengths of light to be filtered and
reflected, creating the feathers' many different iridescent hues.
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