The Immortal Jellyfish

Turritopsis dohrnii, the so-called "immortal jellyfish," can hit the reset button and revert to an earlier developmental stage if it is injured or otherwise threatened. Visit the link for more information
https://www.amnh.org/explore/news-blogs/on-exhibit-posts/the-immortal-jellyfish#:~:text=Turritopsis%20dohrnii%2C%20the%20so%2Dcalled,is%20injured%20or%20otherwise%20threatened.&text=Like%20all%20jellyfish%2C%20Turritopsis%20dohrnii,develops%20from%20a%20fertilized%20egg.