To date, there's only one species that has been called 'biologically immortal': the jellyfish Turritopsis dohrnii. These small, transparent animals hang out in oceans around the world and can turn back time by reverting to an earlier stage of their life cycle. ... Of course, Turritopsis dohrnii isn't truly 'immortal'.

Do all creatures die?

All things that live will eventually die. ... Death is an essential part of the circle of life. Whether you're talking about a human being, an animal, or a plant, every living thing comes alive at some point.

Are starfish immortal?

The animals that can possibly achieve immortality under ideal conditions, such as sea squirts, certain corals, Hydra, and Turritopsis nutricula (the immortal jellyfish), often activate telomerase. ... Out of the animal immortality A-list, sea squirts and starfish have genes that most closely resemble those of humans.