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Wednesday, November 11, 2009 |
Wednesday, November 11, 2009 |
Photo: Reindeer Change Their Eyes for Summer and Winter, Study FindsDuring the 24-hour darkness of winter, reindeer eyes reflect the predominant color of blue (inset right), while in the continuous sunlight of the summer, the eyes shine yellow. Reindeer photograph courtesy Dr. Nicholas Tyler, Univ. Tromsø; inset photograph courtesy Dr. Glen Jeffery, Univ. Coll. London
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ADVERTISEMENTNATIONAL GEOGRAPHIC'S PHOTO OF THE DAY |
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