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It is no wonder Rudolph the red-nosed reindeer is the most famous member of Santa's team -- on top of being a skilled flyer, his nose, as his name suggests, glows bright red. This unusual variation on the reindeer nasal prominence could have all kinds of benefits, the most important of which would involve guiding Santa's sleigh.
According to folklore, if the weather's ever bad on Christmas Eve, Santa's cleared for flight -- by the FAA, for that matter -- thanks to the brightness of Rudolph's nose.