Proof is in the Trivia

 I thought today's e-Trivia Page-A-Day question was interesting:

What is the only large mammal known to have ultraviolet vision?

The reindeer, which is also known as the caribou. Its unique ability to see ultraviolet light enables it to see contrasts in the bright white Arctic landscape. This helps the reindeer find its way, locate food, and spot predators.

It proves Santa's operation is more than a myth!