How reindeer eyes transform in winter to give them twilight vision
Reindeer change the color of their eyes to reflect different wavelengths of light in different seasons.
Reindeer are loved the world over for their dark, expressive eyes, majestic antlers and magical association with Santa Claus. The moment you learn the cold, hard truth of how Christmas presents arrive under the tree is a harrowing one that blights many a childhood. But reindeer are more special than your cynical older sibling or classmates would have had you believe.
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