11 fun facts about reindeer | Whipsnade Zoo
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Did you know that reindeers eyes change colour?
  1. Reindeer noses really do glow red

Whilst not all reindeer are called Rudolf, their noses really do glow red. Their noses are full of blood vessels in a very unique structure which warm up the cold air they inhale. This keeps the reindeers warm on the days where the air temperature can drop to -40 degrees Celsius in their native habitats in Siberia, North America and the Arctic.