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Why is blue so rare in nature?

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Among living things, the color blue is oddly rare. Blue rocks, blue sky, blue water, sure. But blue animals? They are few and far between. And the ones that do make blue? They make it in some very strange and special ways compared to other colors. It’s Okay To Be Smart investigates.

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Additional references


How animals hacked the rainbow and got stumped on blue - NPR
Until about 600 million years ago, seeing colors didn't matter so much to Earth's inhabitants — nobody had eyes. Then suddenly color served as a beacon, alerting predators to tasty food. Find out how animals adapted.

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