1. Turritopsis dohrnii (Immortal Jellyfish)
Known as the “immortal jellyfish”, Turritopsis dohrnii is a small, unassuming sea creature with a remarkable talent. When faced with injury or environmental stress, it can revert its cells to an earlier, polyp stage—effectively starting its life cycle over again.
This process, called transdifferentiation, lets it potentially sidestep natural death from aging. Scientists have studied this unique regenerative ability, and as National Geographic reports, Turritopsis dohrnii’s life-reset trick makes it a top contender for true biological immortality.