Reindeer eyes change color in winter darkness

To survive the wintery conditions in the Arctic, scientists have found that one part of an reindeer’s eyes changes color. This adaptation increases the sensitivity of the animal’s vision, helping it navigate the through the darker months.

The change to the color of the eyes of reindeer is one facet of the animals' ability to adapt to changing conditions in the Arctic, especially the move towards the harsh winter. Other changes that take place include developing thick coats with two layers of fur; the pads on their hooves shrink in winter to give them better traction; and they have the ability to detect ultraviolet light, which helps them see in the months of near-total darkness.

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