Immortal Jellyfish
(Turritopsis dohrnii)

Found across the world’s oceans, the Immortal Jellyfish has earned its name through one of the most extraordinary abilities in the animal kingdom — when stressed, injured, or simply old, it can reverse its own lifecycle on a cellular level, transforming back into a juvenile polyp and starting all over again!

 

Of course, this doesn’t mean it truly lives forever — it can still be eaten, fall victim to disease, or meet plenty of other unfortunate ends...