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Is it magic? Why reindeer eyes change color

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Rudolph the fictional reindeer was famous for his oddly colored nose, but his true-life cousins have eyes that change color depending on the season.

In the summer, the eyes of Arctic reindeer appear gold, and around Christmas they turn to a deep blue, biologists have discovered. It’s not holiday magic, but rather a unique adaptation that helps these animals deal with the strange light conditions at the top of the world.

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