Why do reindeer have different eye colors in winter and summer? Detailed answer

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Why do reindeer have different eye colors in winter and summer? Detailed answer

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Why do reindeer have different eye colors in winter and summer?

The effect of glowing eyes in the dark in many animals is due to the presence of a special structure behind the retina - the tapetum. It reflects the incoming light, causing it to once again act on the retinal receptors, which significantly increases the overall light sensitivity of the eye. Reindeer also have a tapetum, in which the phenomenon of changing the color of their eyes is found: in summer they are golden, and during the polar night they are blue. In winter, the eyes of deer always remain dilated, which increases pressure on the vessels and changes the structure of the tapetum. Although the clarity of vision is reduced due to these changes, due to the greatly increased light sensitivity of the eyes, it is easier for deer to notice predators in the dark.

Authors: Jimmy Wales, Larry Sanger

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Computer view of art 22.12.2007

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