Immortal jellyfish, phoenix of the ocean.

She may not look the part, but this jellyfish is the only true immortal creature on this planet we know of.
Turritopsis dohrnii, also known as the ‘Immortal Jellyfish’ is a small jellyfish that left researchers baffled, and to this day is of great interest for those that seek longivity and immortality. Damage it, stress it, or even kill it, it still won’t die.