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Rudolph's adaptive eyes could pose Christmas problems (2:28) 

Dec. 19 - Scientists have discovered that the colour of Arctic reindeers' eyes change dramatically between summer and winter, as they adapt to extreme changes of light intensity. The researchers say it's part of the animals' defence strategy, although for Santa's reindeer, they say it could also pose problems during next week's round-the-world present delivery marathon. Jim Drury has more.

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