Reindeer eyes change color in winter darkness

By Sarah Zielinski, 17:38 PM October 30, 2013

Life above the Arctic Circle is not easy — cold, wind, snow, a couple months of total darkness — but the creatures that live there have evolved to handle the harsh conditions. Arctic reindeer, for instance, have thick coats with two layers of fur. The pads on their hooves shrink in winter to give them better traction. And they can detect ultraviolet light, which helps them see when conditions are dim.

Researchers in Norway and England have now found another reindeer adaptation: One part of an ...

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