Is there any kind of creature that is immortal even if the average life expectancy of an individual

It's impossible. If such creatures had appeared (bacteria had not counted), humanity would have become extinct. If you think, a beast of prey, live for hundreds of millions of years, reproduce a lot, and eat all humans, the consequences are terrible when you think about it.

Even a docile animal like a rabbit can live for hundreds of millions of years as a potential threat. Rabbits can gnaw on plants. A bunch of rabbits have eaten all the plants, does that man still want to live?

If this kind of creature with hundreds of millions of years of life really appears, then there will be no biological chain, so the biological chain will be completely disrupted. Nature will not allow the existence of organisms that destroy the biological chain.

But as an aside, your imagination is really rich, and I hope to keep it up.

Humans can live for more than a hundred years, and most mammals of medium and large size live less than 30 years. The longest-lived mammal is probably the Arctic right whale, which has evidence to live for more than 200 years. Birds and small rodents are usually domesticated and live longer than wild ones.

The longest-lived fish is the sturgeon; Large tortoises are the longest-lived among both amphibians and reptiles. The ultimate birthday creature among animals may be the curtain clam, which can live for more than 400 years. However, it is nothing compared to some plants or fungi, which can even live for more than 10,000 years.

The longest-lived creature that can be found in natural science is a microorganism called Methuselah, which lives in sediments and is said to have lived for 2.6 billion years, having been a classmate of the dinosaurs. - 2.6 billion years! God, it's dizzy to think about!

What's even more interesting is that in order to survive, this creature is said to have reduced the rate of its metabolism to a level that even modern instruments cannot detect.

German scientists recently discovered one of the longest-lived organisms to date, a sponge that lives in the Antarctic ocean, with a lifespan of more than 10,000 years. Previously, the longest-lived creature found was the pine tree that grew in the United States, which lived for more than 5,000 years. This sponge is more than two meters long and grows extremely slowly.

Although scientists began studying this sponge 20 years ago, it is difficult to determine its exact lifespan because this sponge does not form growth rings during growth. Recently, scientists at the German Centre for Polar and Marine Research have estimated its lifespan by measuring oxygen consumption.

In nature, the longest-lived creature is the ginkgo tree, which can be more than 3,000 years old. What's even more peculiar is that as a tree species, the ginkgo tree has maintained its characteristics unchanged for more than 200 million years, and the dinosaurs of the same era have long been extinct, but only the ginkgo tree is still full of vitality.

Lighthouse jellyfish I don't know if it counts.

The longest-lived creatures in nature are: turtles, koi fish, bowhead whales, Arctic clams, Greenland sharks, red sea urchins, Antarctic sponges and lighthouse jellyfish, and these eight creatures are also known as the eight longest-lived animals, one of which can live forever. As for why they live so long, scientists don't have a real answer.

The first type: turtles.

This is the one we are most familiar with, some people still keep turtles as pets, and there is a joke that if you keep them well, they can send you away; It can be said that people praise the lifespan of turtles. Can that turtle really live that long? The thousand-year-old king 80,000-year-old tortoise, can it really live for 10,000 years?

Actually, no, according to the research of scientists, the turtle that has lived the longest so far is a Galapagos turtle named Harrie in the Australian Zoo, the cause of death of this turtle is heart failure, and finally lived to be 175 years old, so there is no such thing as a thousand-year-old tortoise.

The second type: koi fish.

Koi fish are a symbol of good luck and at the same time a symbol of the longest lifespan; There are wild koi and captive-bred koi, the longest lifespan of captive is about 70 years old, and the wild can live up to 226 years old.

The third species: bowhead whales.

The bowhead whale is a marine creature that lives in a cold environment and has a recorded lifespan of 150-200 years, including fertility at the age of 90.

Fourth: Arctic clams.

The Arctic clam is an edible shellfish that, according to scientists, has found that its longest lifespan can reach 405 years, which is really shocking.

The fifth: Greenland sharks.

Sixth: red sea urchin.

Seventh: Antarctic sponge.

Antarctic sponges are creatures that live at a depth of 2,360 meters on the ocean floor, and this sponge is basically motionless on the bottom of the sea, and can live up to 1,550 years old.

The eighth: lighthouse jellyfish.

Lighthouse jellyfish are called immortal creatures because they have a special ability to constantly renew themselves.

What I know of is that sea turtles have the longest lifespan, and it is said that the longest living turtles that have been found are more than 300 years old. They are large and bulky, with short legs and a solid shell, and it is good to retract into their shells when they are in danger, which should be one of the reasons for their longevity.

The turtle with the longest life should be the turtle, we all say that the turtle has a nickname is the thousand-year-old king, and the life span of the turtle is generally shown in the records as the longest, and the longest lived for 152 years.

According to scientists, there are about 200 species of turtles in the world, and their lifespans vary depending on the species. Our family-raised turtles generally only live for 20 to 30 years; Sea turtles live slightly longer, between 80 and 120 years; The average lifespan of the Aldabra tortoise is around 120 years; And a terrestrial turtle called Galapagos even lives up to 150 years.

This question can be written hundreds of articles that can be listed in Nature, because it is too complicated, but in simple terms, it is the role of genes, and environmental differences can also cause a certain degree of difference.

This is between people, that is, life is the same.

The most fundamental problem is the genetics.