The turritopsis nutricula species of jellyfish may be the only animal in the world to have truly discovered the fountain of youth.
The World's Only Possible Immortal Living Being
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Since it is capable of cycling from a mature adult stage to an immature polyp stage and back again, there may be no natural limit to its life span. Scientists say the hydrozoan jellyfish is the only known animal that can repeatedly turn back the hands of time and revert to its polyp state (its first stage of life).
The key lies in a process called transdifferentiation, where one type of cell is transformed into another type of cell. Some animals can undergo limited transdifferentiation and regenerate organs, such as salamanders, which can regrow limbs. Turritopsi nutricula, on the other hand, can regenerate its entire body over and over again. Researchers are studying the jellyfish to discover how it is able to reverse its aging process.
More info at :
http://en.wikipedia.org/wiki/Turritopsis_nutricula 
too cool! that is one radical jelly.
Nice info bro:-*
Good info 
Interesting information. Should give you credit for sharing it with us. 
thatz a very good effort.but my question is: can it survive on land? ofcourse NO.then it is mortal cos no creature is immortal except d Creator.
Nice topic really educating
mustafa: thatz a very good effort.but my question is: can it survive on land? ofcourse NO.then it is mortal cos no creature is immortal except d Creator.
I said POSSIBLE IMMORTAL. Its a water creature and it is supposed to stay in water. What is it
Great topic
Wow.... Eternal youf 2 b grapped
enjoy am enjoyen my self 2
Cool info!
Wonders still exist
Can we transfer their genes to our genes So that we become immortal. Anyways nice topic
Nice info

I like the attachment.