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October 26, 2006 6:27am CST
Most animals don't eat moss. It's hard to digest, and it has little nutritional value. But reindeer fill up with lots of moss, because the moss contains a special chemical that helps reindeer keep their body fluids warm. When the reindeer make their yearly journey across the icy Arctic region, the chemical keeps them from freezing-much as antifreeze keeps a car from freezing up in winter.