World's Only Immortal Animal.

World's Only Immortal Animal

Turritopsis nutricula is the world's only immortal animal. It's a tiny jellyfish, 4-5 mm in length. When the jellyfish reaches sexual maturity, it transforms its old cells into new ones through the process called transdifferentiation. By renewing the cells continuously, the jellyfish stays young forever. It dies only when it gets killed or eaten by other animals. As of today, this jellyfish is the only known immortal animal on Earth, capable of reversing the aging process.
Here is how it looks:

Chetan Bhatt