Editor's note: They have amazingly agile tails that act as an extra hand, they carry their babies in a pouch, and they’re excellent swimmers. But first and foremost, they gave us the term “playing possum” for “playing dead,” one of the many defense mechanisms they use when threatened. Not many animals manage to work themselves into the English language in such a permanent way, so join us in honoring this one by getting some cool Opossum wallpapers!