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From:
All About Birds
(Uncensored)
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What Is the Essence of Iridescence? Ask a Hummingbird | Living Bird | All About Birds
https://www.allaboutbirds.org/news/what-is-the-essence-of-iridescence-ask-a-hummingbird/
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Microscopic secrets hidden away in hummingbird feathers manipulate light to give these tiny birds—the most colorful birds on Earth—the power to dazzle on command.
