18. Santius Clausadae

If you’re an avid pursuer of rare and unique species, this is a very exciting time for you. Christmas Eve is when you have the best chance of catching a glimpse of the elusive Santius Clausadae, more commonly known as the Santa Claus.

How he makes toys with those flippers is anyone’s guess.

Unfortunately, researchers have yet to successfully acquire DNA samples from this creature. We’re instead forced to speculate on how the Clausadae species looks and behaves in order to survive in it’s natural habitat: the arctic.