Jellyfish usually die after propagating but Turritopsis Nutricula reverts to a sexually immature stage after reaching adulthood and is capable of rejuvenating itself. The 4-5mm diameter creature, technically known as a hydrozoan (a class of very small, predatory animals which can be solitary or colonial and which mostly live in saltwater) is the only known animal that is capable of reverting to its juvenile polyp state. Theoretically, this cycle can repeat indefinitely, rendering it potentially immortal."Geek out" more on the Turritopsis Nutricula.
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