Marvel at the various life cycle of the fantastical Turritopsis nutricula, a jellyfish that is, for all practical purposes, immortal. This strange creature reaches adulthood, transforms itself back into a child, then lives through it’s life again. Think of it as Groundhog Day with a jellyfish.
While old age can’t kill it, the creature is still susceptible to disease and fatal injuries. Read more about this fascinating forever-fish here.