20 ANIMALS THAT DO NOT DIE NATURALLY

Immortal Animals Who Defy Death


For many years, humans have sought absolutely everything in order to attain immortality. This endeavor includes the search for the so-called “ Fountain of Youth ” and even freezing cadavers in the hope of preserving and bringing them to life in the future.
Apparently, there are already a number of existing plant and animal species that are seemingly deathless, if not, can live for a very long time when compared to the lifespan of humans.
To put it in other words, these organisms could die as they might get killed by either a predator or a destructive change in the environment, or suffer from a disease. But unlike humans, they rarely die because of old age.
Below are some of these amazing biologically immortal animals that actually live in this world. Information about these animals are given in this form:
Binomial Name
Phylum
Class
Order
Family
Genus
These Immortal Animals include


Aldabra Giant Tortoise
1.Geochelone gigantea
Chordata
Reptilia
Testudines
Testudinidae
Aldabrachelys
Aldabra Giant Tortoise
255 years (confirmed)
As their name suggests, these tortoises are one of the largest species of tortoises in the world. These tortoises take a very long time to grow as they do not reach sexual maturity until over 30 years old. The oldest confirmed age of a tortoise was 255 years. This tortoise was Adwaita at the Alipore Zoological Gardens in Kolkata India. However, scientists have revealed that some may have persisted twice that age.


Bdelloids
2.Bdelloidea
Rotifera
Bdelloidea
Adinetida
Philodinavidae
Rotaria
Bdelloids
Lifespan: One hundred Million Years (Immortal)
Bdelloids are a group of freshwater rotifers (zooplankton) that can be considered “ immortal ” in a sense that they can tolerate extreme conditions like high heat, low temperature, and extreme pressure. Furthermore, they can also enter a state of “ hibernation” and come back when they wish to do so.


Bowhead whales
3.Balaena mysticetus
Chordata
Mammalia
Cetacea
Balaenidae
Balaena
Bowhead Whales
Lifespan: 200+ years
Aside from their humongous size, another astonishing fact about bowhead whales is that they can live up to more than a hundred years. The secret to this? They can repair damaged DNA, hence are prevented from developing cancer. Scientists also suggested that these whales can survive the absence of oxygen even for a long time.


Clams
4.Arenaria (steamer clam)
Mollusca
Bivalvia
Myoida
Myidae
Mya
Clams
Lifespan: 400+ years
Believe it or not, some species of clams can live up to more than 400 years. Scientist explain that their long lifespan can be attributed to a process called “ slowed cell replacement” but at present, there are still no reasons stating what makes them mature at a slow rate. This process too is still up for further studies.


Glass sponges
5.Scolymastra joubini
Porifera
Hexactinellida
Lyssacinosida
Rossellidae
Scolymastra
Glass Sponges
Lifespan: 15,000+ years
Although they’re not necessarily deathless (due to some inevitable instances like being eaten by predators), some species of glass sponges can survive up to more than 15,000 years! This is because some species can control the growth of their spicules (mineralized structures) at a very slow rate, hence slowing down their aging process.

Greenland shark
6.Scolymastra joubini
Porifera
Hexactinellida
Lyssacinosida
Rossellidae
Scolymastra
Lifespan: 272+ years
Known as the longest living vertebrate with an average lifespan of 272 years, this species of sharks does not reach sexual maturity until 150 years. The secret to this is pretty obvious– its incredible ability to withstand the intense darkness and freezing temperature at 2200 meters depth.

7.Hydra
Animalia
Cnidaria
Hydrozoa
Anthomedusae
Hydridae
Lifespan: Immortal
According to researches, the hydra is one of the few animals that does not show any signs of deterioration with age. Being able to continuously divide and regenerate new body cells , hydras can basically keep themselves young for long periods of time (even until forever).

To be continued.......

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