From childhood, we are thought that everything that takes birth has to die someday and nothing is forever. But there are some animals that are immortal and can live forever if not killed by someone or diseases. Here is a list of five creatures that are immortal and can live forever naturally. 

Jellyfish 

Jellyfish is the only species found to date which can be called ‘biologically immortal’. These are small, transparent creatures found in oceans that revert back to the earlier stage of their lifecycle. 

The first name on this list is the tiny variety of jellyfish known as Turritopsisdoohmii, also known as the immortal jellyfish. According to National Geographic, it can literally live forever by actually reversing its aging process. In case it gets injured or sick, it gets back to its polyp stage during a three-day period, converting its cells into its younger form that will ultimately grow into adulthood all over again.

Hydra

Hydra is a very simple creature that spends most of its time staying in the same place in freshwater ponds or rivers. They use their stinging tentacles to catch their prey that happens to come near. 

It seems this creature doesn’t go through the process of biological ageing at all. In the place of gradually fading away over a period of time, the stem cells of a Hydra have the capacity to self-renew itself an infinite number of times. It is most likely because of a particular set of genes known as FoxO genes, which are found in worms to animals to humans and play an important role in regulating how long the body cells will live for. Hydra’s stem cells, there seems to be an overabundance of FoxO genes giving them the ability to reinvent the cells.

Planarian Worms

Planarian Worms are also known as flatworms are well known for their regenerating abilities and they can’t die until it’s killed by someone. 

Researchers have found out that there is a species of flatworm that is not affected by the aging process and can be possibly immortal. Planarian worms have astonished scientists with their seemingly limitless capability to revive their body cells. Researchers have been studying their capability to swap aged or damaged tissues and cells in an effort to comprehend the mechanisms that leads to its longevity.

Lobsters

Lobsters are not literally immortals but they can rather lead quite a long life if not killed by their predators.  

The most common cause of death among lobsters is disease, not old age. They can grow and reproduce until they die because of some ailment or killed by predators. One lobster was once captured at the coast of Newfoundland and it was estimated that its age to be 140 years old, but mostly the males survive till their 30s while females can live up to an average of 54 years.

Turtles

Like the Lobsters, Turtles are also not technically immortals. But their organs don’t get damaged over time and can live a rather long life.

Turtles have been known to live as long as 100 years and researchers have discovered that their organs don’t seem to break down with passing time. According to a report by The New York Times, turtles are capable to live forever if they can protect themselves from predators and disease. In other words, they certainly have the capacity to live indefinitely.