PHReindeer eyes turn blue in the winter
Reindeers have truly blue eyes—but only in the winter! According to the You do not have permission to view the full content of this post. Log in or register now., "the eyes of Arctic reindeer change color through the seasons from gold to blue, adapting to extreme changes of light levels in their environment."
The change in color impacts how light is reflected through the animals' retinas, and improves their vision.
(S) bestlifeonline