Scientists at Dartmouth College have unlocked a Christmas mystery, natureworldnews.com reports.
Researchers examined the unique eyes and vision of Arctic reindeer to find out how they might function on a foggy Christmas Eve.
Turns out that unlike most mammals, Arctic reindeer (Rangifer tarandus tarandus) can see ultraviolet light -- a rare trait that comes in really handy when reindeer have to guide Santa around the world in mid-winter, when the sun is low on the horizon and the light is a dim blueish to ultraviolet color. The reflective tissue in reindeer eyes adapts to winter by changing to a deep blue color, which in turn helps the animals see blue light.
So far, so good. However, this trait does not help in the fog -- and that's where Rudolph's glowing red nose comes in. Red light works best in fog, making it the ideal fog light to guide his fellow reindeer.
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