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"This ability to reverse the biotic cycle (in response to adverse conditions) is unique in the animal kingdom, and allows the jellyfish to bypass death, rendering Turritopsis dohrnii potentially biologically immortal."

Turritopsis dohrnii is also known as the 'immortal jellyfish'. (Yiming Chen/ Getty Images)

Excerpts taken from BBC earth
"The animal that lives forever"
By Chris Baraniuk

Excerpt taken from Wikipedia
"Turritopsis dohrnii"

The animal that lives forever

"The so-called 'immortal' jellyfish, or Turritopsis dohrnii, can somehow reprogramme the identity of its own cells, returning it to an earlier stage of life. In other words, it can age in reverse and morph from an adult back into a baby."

"...the adaption remains remarkable and two other jellyfish have recently been discovered to have it, including Aurelia sp., native to the East China Sea."