The immortal jellyfish is a tiny animal found in temperate and tropical waters with an astonishing ability to live on after its normal life cycle.
The transparent bell of the immortal jellyfish measures just 4.5 millimeters / 0.15 inches in diameter. Juveniles only have eight tentacles, whereas adults have 80—90.
The incredible attribute of this tiny jellyfish is its ability to live on after its normal life cycle is complete. Instead of dying after its adult phase is finished (or when facing a lack of food or threat from predators), the animal drops to the seabed and becomes a polyp once more and spawns new clones to live again.