Fun fact 3/9/2017

Reindeer can spot predators and food against a snowy backdrop thanks to an unusual ability to see UV light. Its primary winter food source, lichens, and the fur of its main predator, the wolf, both absorb UV light, which makes them stand out against (wolf) and below (lichens) the UV-reflecting snowy landscape.

https://www.scientificamerican.com/article/a-skill-better-than-rudolphs/

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