Color Shift: Why don't reindeer need sunglasses in winter?

Because their eyes have a built-in seasonal adaptation! In summer, reindeer eyes are golden, but as winter approaches, they turn a deep blue. This color change enhances their vision during the long Arctic nights by improving their ability to detect predators and forage in low-light conditions. The shift happens because of pressure changes in their eyes, which alter how light is reflected. Essentially, their eyes act like a natural pair of night-vision goggles, helping them survive the harsh polar winters. royalsocietypublishing.org

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