Human life can be considered as short on Earth if we compare it with some animals. According to WHO, humans have an average life expectancy of 72 years. Some creatures on Earth are immortal, and some can live up to thousands of years. Lots of researches are being carried out by scientists to find out why animals live so long.
Long living creatures on Earth –
Turritopsis dohrnii –
It is also known as the immortal jellyfish, which is found worldwide. This jellyfish has no brains and heart. According to scientists, they do not die of old age; living up to a certain age, they begin to get younger and return to their original stage. They again started to develop from the stage of a young individual. There is no limit to how many times they can do this.
They began their life as tiny, free-swimming larvae called planulae. As planulae settle down, it gives rise to a polyps colony attached to the seafloor. From a single planula, all the polyps and jellyfish arise and are genetically identical clones. At a rapid pace, they have been known to prey on other jellyfish species when sexually mature. They can revert to the polyp stage and form a new polyp colony if they are exposed to physical assault, or sick, or old, or environmental stress.
Red sea urchin –
It is found in the northeastern Pacific Ocean from Baja California to Alaska and is a sea urchin. This urchin lives in shallow waters from the low tide line to greater than 280 m deep. In areas where kelp is available, on rocky sheltered from extreme waves, it is typically found. On the ocean floor, they can be seen crawling with the help of their spines. It is one of the longest living animals and can live up to 200 years.
The spherical body is entirely covered by sharp spines which grow on a hard shell called a test that encloses the animal. On the bottom of the surface, the animal has a mouth with special jaws.
Homaxinella balfourensis –
It is a species of sea sponge and found in the seas around Antarctica and grows in two forms. One forming an upright club-like structure and another one is branching out in one plane like a fan. Every year the sponge grows by 0.2 mm and lives at a depth of about 200 m where there is no sunlight. It can live up to 5,000 to 15,000 years by reducing the metabolic process.
Koi Fish –
The colored variety of the Amur carpth is kept for decorative purposes in water gardens or outdoor koi ponds. There are many varieties of Koi, and breeding began in the early 19th century in Niigata, Japan. Japanese recognize many types, distinguished by coloration, patterning, and scalation. Some primary colors are red, orange, brown, cream, white, black, yellow, and blue. On average, this fish lives up to 40 to 50 years.
It is a genus of tubes worms and lives in deep-sea cold seeps where the seafloor hydrocarbons are licking out. For their nutrition are entirely reliant on internal, sulfide-oxidizing bacterial symbionts. Its length exceeds 3 meters and grows very slowly, and can live up to 250 years. Biogenic habitat is formed by creating large aggregations of hundreds to thousands of individuals. Over 100 different species of animals live in these aggregations, many of which are found only at these depths.
Giants Galapagos Tortoise –
It is a species complex of 15 giant tortoise species. These tortoises are the largest living species of tortoise. Morden Galapagos can weigh up to 417 kg. In the wild, they have a life span of 100 years and are one of the longest living vertebrates. Captive Galapagos tortoises can live up to 177 years.
They are native to the seven of the Galapagos island. Between population, cell shape and size vary. The tortoise on the island with humid highlands are more enormous, with domed shells and short necks and on islands with dry lowlands are smaller, with saddleback shells and long necks.
Bowhead whale –
It is a species of baleen whale and is found in the Arctic and subarctic waters. This whale is named after its characteristic massive triangular skull, and to break through the ice; it is used. It has the enormous mouth of an animal and can reach up to the age of more than 200 years. The oldest one known is 211 years old. This whale has a gene in its body, ERCC1, that keeps preparing the DNA in the body and because of this, it does not have any severe disease. They grow up to 200,000 pounds and 60 fets and around 220,000 pounds of food it eats in a year.
Rougheye rockfish –
It is a rockfish and grows to a maximum of about 97 cm in length and weighs around 6.7 kgs. This fish is a long-lived fish and has been known to reach an age of 205 years. It is found in the Pacific Ocean from California to Japan. In the lower eyelids, spins are located, and because of this, the name is giving. At the back of the operculum is often a darker patch, and it is pink, tan or brownish with irregular patches of brown of darker color in the fish.
Greenland Shark –
It lives deep in the North Arctic Ocean and the Atlantic Ocean belonging to the somnios family. The shark can grow up to 24 feet long and is the only shark that can tolerate Arctic temperature all year round with a temperature of 7 to -2 degrees. Among all vertebrates species, it has the longest life span, is estimated between 200 to 500 years, and is among the most significant extant shark species. The maximum age of this shark could be determined at 392 years. Due to the high concentration of Trimethylamine N-oxide in its tissues, the meat is toxic. The shark flesh is eaten in Iceland.
It is a reptile found in Newzealand. For over 200 million years, it has inhabited Earth and leads only a nocturnal lifestyle. The lizard lives up to 60 years, but they can live over 100 years in captivity, reaching a length of 76 cm. Tuatara is grey and greenish-brown and weighs up to 1.3 kg and has a spiny crest along the back, especially seen in males. It has in the upper jaw two rows of teeth overlapping one row on the lower jaw and this is unique among living species.
Asian Elephant –
It is found in India, Southeast Asia and three subspecies are recognized. This elephant is the largest living animal in Asia. They have a life span of around 60–75 years. But now their population has declined by 50%.