|Hot Spring in Yellostone National Park|
|Wunderkammer Moss Piglet|
There are other types of multicellular extremophiles, like the deep-sea bristle or Pompeii worms that live around hydrothermic vents and sport red tentacle-like gills, or ice crawlers, wingless insects that live atop the coldest mountains, but nothing beats a moss piglet.
If I were an astrobiologist (someone who studies the possibility of life in the universe) I would have one as my mascot, perhaps even a cuddly tardigrade teddy on my desk. Believe it or not they exist too. You can learn how to knit one at Wunderkammer.