With the increasing degree of pollution of the earth, the relative reduction of the total area of the world's jungle, many species that are not suitable for the environment have gone extinct, especially large mammals, food shortages and climate change pose a great threat to their survival and reproduction, many large animals are either frozen to death, or starved to death and thirsty, the ending is very tragic.
Since the rapid development of human society, people have begun to over-exploit and use various earth resources, the total number of animals in nature, like resources, has been decreasing, many species have disappeared permanently, dinosaurs, mammoths, Caucasian bison, Javan tigers, etc., are really numerous, so that many scholars suspect that the sixth mass extinction is coming.
These species have never appeared since they went extinct, and we can only see the appearance of extinct species from photos and hypothetical maps, and some scientists have pessimistically believed after some research that the largest animal on land in the future will be cattle. Although this is only an opinion rather than a fact, it is still worthy of our attention, and we must protect the natural environment and love wild animals.
However, there are many wild species in nature that have appeared after being declared extinct by experts, reappearing in front of researchers' eyes, as evidenced by photos, why can species appear after extinction? The reason for what seems to be a violation of the laws of nature has been controversial, and now a new study from PNAS points to the return of an animal that has been dead for 50 years.
47 years after the demise of guinean singing dogs appeared
On the island of New Guinea in Oceania, there used to be a mammal known as the New Guinea Singing Dog, and in 1897, scientists conducted a survey of the New Guinea Singing Dog and found that it could produce a unique sound, which was very loud and beautiful, which became the focus of people's attention, but the number was running out.
So someone put the New Guinea singing dog into a nature reserve isolated from the outside world, when the last 300 were left, it has entered the extinction of the brink, it is reasonable to say that the dog is the most viable species in the world, but do not know what the reason, by 1970, the captive 300 New Guinea singing dogs have died one after another, and later scientists have not found any trace, thus declared the extinction.
But in 2016, 47 years after the extinction was declared, the researchers rediscovered a species similar to the New Guinea dog breed in the wild, known locally as the "Highland Wild Dog", and after some identification, the alpine wild dog and the New Guinea dog breed were the same breed. The Highland Wild Dog has been around for a long time, much longer than the New Guinea Singing Dog, and is considered the rarest and oldest dog.
The new Guinea singing dog is back, which is great news, the natural species have given humans another chance, we have to protect it well, no longer let it go extinct, but scientists are worried, because the number of highland wild dogs is also running out, in the words of research, "the number is wandering", which means that the number has not increased or decreased.
The smallest deer species that has been extinct for 30 years is being seen again
In the impression of many people, the deer is a large animal, more than the giraffe up to 6 meters high, but the world's smallest deer is not much larger than the white rat, the soles of the feet have hooves instead of claws, 30 years ago, researchers have seen it many times in the Vietnamese jungle with trap cameras, so it is named "Vietnamese mouse deer", china calls it silver-backed Chevrolet.
Due to the reduction of the number of jungles, coupled with the "Vietnamese rat deer" is a local special delicacy, many foodies do not spare thousands of miles, just to taste a delicious dish, so the number is getting smaller and smaller, in 1990, it is regarded as the world's last Vietnamese rat deer was also hunted by humans, so scientists officially declared the Vietnamese rat deer extinct according to the development trend at that time.
But in November 2019, when the researchers came to another dense forest again to drop 30 trap cameras, there was an unexpected harvest, and of the more than 1,000 photos, 275 photos excited the researchers, because the photos clearly recorded the tracks of Vietnamese rat deer activity, and there were still many of them, and it seemed that Vietnamese rat deer were alive and did not really extinct on Earth.
Why multiple extinct animals finally reappeared, is it a good thing or a bad thing
Experts believe that it may be that some animals have made changes to their living habits in order to adapt to the environment, a small number of animals intelligently moved their habitats to more remote areas, rarely affected by natural enemies and humans, and then restored the number of animals, it may be that this animal actually survived in another remote area for a long time, before humans did not find, so it was declared extinct.
In short, extinct creatures finally appeared again, which is definitely a good thing for the earth, not a bad thing, indicating that the earth's organisms will also change the environment, will not wait for death, but through wisdom to find a way to survive, which is why some organisms on the earth have bred for hundreds of millions of years and still exist, although it seems to violate the laws of nature, but in fact in line with the evolutionary history of species, how do you see. Interesting scientific exploration content, please pay attention to the only WeChat public account: Interesting Exploration