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The turritopsis nutricula, a transparent 4-5mm diameter predator normally found in warm tropical waters, is the only known animal that is capable of reverting to its juvenile polyp state, the Times Online reports.
Jellyfish usually die after propagating but Turritopsis is capable of rejuvenating itself and reverting to a sexually immature stage after reaching adulthood.
Theoretically, this unique cycle can repeat indefinitely, rendering it potentially immortal.
Marine biologists and geneticists are researching how the jellyfish essentially reverses the ageing process.
It is thought that the creature's cells can actually transform from one type to another.