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Reindeer's Eyes Change Color With Seasons
 

Reindeer's Eyes Change Color With Seasons

Reindeer All animals, including humans, can adapt their eyes to the changing level of light. In dark conditions, muscles in the irises contract to dilate the pupils and allow more light into the eyes. When it's bright again, the irises widen and the pupils shrink. The same thing happens to reindeers. But when the arctic winter brings perpetual darkness for months on end, something more happens to reindeer's eyes causing them to change color. The arctic reindeer is the only mammal whose eyes shine a diffe... read more

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