No animals are truly immortal, but there are some species that exhibit extreme longevity and a remarkable ability to regenerate cells, such as the jellyfish Turritopsis dohrnii, also known as the "immortal jellyfish." This species has the ability to revert back to its juvenile form after reaching maturity, essentially restarting its life cycle. However, even these animals are not considered truly immortal as they can still be affected by disease, predation, or environmental factors.
