At the age of 40, the eagle's beak becomes curved and long, which seriously hinders eating; Paws get old and can't catch prey; Feathers thicken and cannot fly quickly for a long time; At this time, there are two ways in front of the eagle, either slowly waiting for the arrival of death, or metamorphosis and rebirth.
bald eagle
The process of eagle rebirth is very difficult. It needs to beat the rock with its beak to make it fall off and grow a brand-new beak, then pull out its nails one by one with its new beak, and finally pull out its feathers one by one with its new claws. The whole process of metamorphosis is very difficult and long, but it is all worthwhile, because after five months, when new feathers grow, the eagle will be reborn, thus gaining a life span of 30 years.
The whole story sounds inspiring, but it also deceives many people. In fact, this does not exist in nature. One of the biggest contradictions is that the eagle's beak cannot grow back.
olecranon
Birds can grow feathers and nails, but if the beak is gone, it is really gone. The growth of all animal body tissues is essentially controlled by DNA. For example, our human hair and nails can be regenerated, so we cut them off again and again and grow back soon. However, limbs, ears and nose are non-renewable. If it is missing, it can only be repaired by modern medicine, not by the regenerative function of the body, and so can the beak of birds.
In reality, human beings have saved many wild birds, many for them? Oral surgery? For example, Guangzhou Lide Animal Hospital installed titanium alloy on a red-crowned crane with modern 3D printing technology? A fake beak? The reason is that this red-crowned crane had a fight in July of 20 16, and its beak was broken. Eagle reborn? In the story, the beak of this red-crowned crane can grow completely. Why do humans go to so much trouble to put a fake beak on it? Obviously, from this perspective, some phenomena in the story are untenable.
The staff fitted the red-crowned crane with a false beak.
Artificial beak of red-crowned crane
In reality, most birds pluck their hair because of disease. In nature, it is a very common phenomenon for birds to pull some feathers from themselves. For example, when they build a nest, they will pull some down from their bodies. Building materials? Some wild birds will maintain proper body temperature by plucking some feathers, but if all feathers are plucked, it is a pathological phenomenon.
In academic circles, it is called. Hair removal? This is a psychological disease of birds, and the symptoms are mostly self-shedding. Feather plucking is found in many kinds of birds all over the world, especially domestic pet birds, which are more likely to appear.
Plucked parrot (middle)
There are many reasons why birds pluck their hair. For example, most parrots in the world are extremely intelligent social animals, so they naturally need to socialize. However, if raised as a pet bird, the breeding environment is narrow and monotonous, which can not meet the daily social needs of parrots, and some psychological diseases will gradually appear.
This phenomenon is easy to appear on pets, especially novices, who don't understand the personality characteristics of pets and keep them unscientific. To put it simply, most birds pluck their hair for the following reasons.
Some parrots are plucking feathers.
Environmental problems Most birds are lively and like to jump up and down. However, in the artificial breeding environment, birds often live in a small cage, which not only can't fly at all, but also brings them great psychological pressure. Over time, there will be some psychological diseases, such as depilation and stress disorder.
In reality, there are many examples of animals suffering from mental illness due to environmental problems. For example, in the zoo, we can often see tigers circling in their small gardens. They look cute, but what about this one? Cute? Behind it is helplessness, what do we call it? Rigid behavior? .
The main reason for this phenomenon is the problem of feeding environment. In order to reduce the stereotyped behavior of animals, the most important and effective means at present is to enrich the environment. We can simply understand it as transforming the animal survival park to achieve a certain complexity, improve the quality of life of animals, and then reduce the probability of mental illness of animals.
In the physiological stage, birds will take the initiative to pluck their hair, and sometimes it may be caused by internal factors. For example, some parrots will become irritable under the influence of endocrine hormones during estrus, which is completely opposite to their usual state.
If it is in the wild, it can be solved through a series of social behaviors such as same-sex struggle, heterosexual attraction and mating, while birds in domestic state will have a series of psychological obstacles because they cannot meet their social needs. From the appearance, most of them will pluck their hair.
Emotional changes Most domestic pet birds are essentially social animals, but as domestic pets, most families do not have the conditions to raise a large group, and most of them are raised alone, and they will get bored over time. Since you are bored, you need to find something to do, and it is understandable to pluck your own hair.
In fact, the emotional changes of birds are varied, especially parrots, which have high IQ. If they don't get the right vent, it's easy to suppress their mental illness.
Disease factors of course, bird plucking may sometimes be a simple physiological disease. For example, if they don't pay attention to hygiene and breed many parasites, they will easily lose their hair. In addition, even if it doesn't fall off, when birds feel itchy and scratched, they will scratch off their feathers.
Distinguishing between pathological and psychological bird plucking is actually very simple, just looking at the skin without feathers. If you can see obvious redness, decay and other phenomena, it is undoubtedly pathological. At this time, you need to take them to see a pet doctor.
The parrot plucked the feathers from its wings.
To sum up, birds? Large scale? Pulling feathers, mainly for? What's the matter with you? Obviously, a bird with a healthy body and mind would not do such a thing. Bird pulling mostly happens to domestic pet birds. For example, a study shows that about 10% of captive parrots in the world will pluck their hair, which is an act of venting their emotions.
Wild birds are unlikely to pluck their hair, and most of them pluck their hair just to survive, such as nesting as mentioned above. In the story of the eagle's rebirth, it is completely against science to pluck all its feathers.
Domestic parrot
Aging is not only an external morphological change, but also a decline in physiological function. The eagle plucked its feathers and reborn? There is also a more obvious anti-scientific common sense error in the story, that is, the eagle returns to its prime by removing the external forms of aging, that is, aging claws, excessively bent long beaks and dense feathers. Right? Rejuvenation? Really?
Although it seems reasonable to get rid of aging things and return to youthful vitality, it is actually not that simple. Aging is an irresistible natural law. Although it is disturbing that external conditions can accelerate or slow down this process, such as changes in environmental temperature, which can change the life span of animals, aging is also a process that develops over time, so the eagle plucks its feathers and nails, which will not reverse this process.
The simplest truth is that a 70-to 80-year-old person can remove wrinkles through surgery and make himself look like a young man, but he is still an old man in essence, and his physical skills will never be better than those of young people.
So is the eagle. Although plucking feathers can make it get a brand-new feather, the internal organs of the body are old, so what's the use of shallowness?
Aging has an inherent feature, which is the spontaneous and inevitable process of the body. Although the environment can slow down this process, it is irreversible and cannot be completely stopped.
In the wild, eagles can't live for 70 years. The eagle mentioned in the whole story is not specified, so in theory, all species of the whole family can be the protagonist of the story.
The family Carniidae is not the largest family among birds, but it is abundant, with a total of 10 subfamily and 236 species. However, none of these 236 species of wild eagles can live to 70 years old, and even over 50 years old is considered as longevity.
Like to appear often in? The eagle plucked its feathers and reborn? The goshawk in the story screen has a wild life span of only about 10 years. Although its life span has been prolonged under artificial breeding, it is only about 27 years old, which is far from 70 years old.
goshawk
Other kinds of golden eagles often appear in pictures and have a long life among birds. At present, the highest reliable record is only 23 years. The longest life span of wild vultures is 38 years, and the average life span is about 20 years. Although the image of vultures looks more in line with the appearance of plucking feathers, their life span is not long among eagles. In the wild, they usually live less than 20 years, and only a few can live for 39 years.
Most eagles are not the longest-lived birds in the world, and kakapos, as one of the longest-lived birds in the world, live for about 50-60 years in the wild, not more than 70 years old.
vulture
Maybe everyone is paying attention to this phenomenon. Animals raised artificially usually live longer than wild animals. There are multiple reasons for this, which are nothing more than external and internal causes. If there were no natural enemies to kill them, there would be no cruelty of survival competition. Even if animals fail to catch prey after aging, there will be human care.
In the artificial feeding environment, the food supply is sufficient and the nutrition is balanced, which can meet the daily survival needs of animals and naturally make them stronger. In addition, a series of sanitary conditions and disease treatment are guaranteed in the artificial feeding environment. As mentioned above, the aging of the body is disturbing, so a suitable feeding environment can naturally prolong the life of animals.
bald eagle
The whole story of the eagle plucking its hair and reborn seems very inspirational, and many people believe it, although? The world is full of miracles? But I say it responsibly? This is really not? . Many of these pictures like to put photos of vultures. It is true that its bald head looks like it has just plucked its feathers, but it is not.
There are many vultures, such as Andean vultures, vultures, vultures and so on. Why are these birds? Bald? I didn't pluck the feathers, but the result of species evolution.
griffon vulture
The main food source of vultures is carrion. What is their ecological function? Scavenger? However, animal carcasses often mean that there are parasites and bacteria. Although vultures have a strong digestive system, their gastric acid is very corrosive, which can kill most bacteria and parasites instantly, and at the same time, they also have high tolerance to some toxins in carrion.
Simply put, its digestive system is born to eat carrion, so even if it eats carrion all the year round, vultures are still healthy.
bald eagle
But the skin of these birds is not as strong as its digestive system. They need to bury their heads in the meat, and their heads are usually covered with animal carrion residue. At this time, it would be easier if they had more feathers on their heads? Hide evil and accept evil? It is very easy to breed bacteria and get some diseases, so in the long process of species evolution, some individuals with less feathers on their heads have more advantages in the future survival competition, and such individuals are constantly selected. Bald? This trait has also been preserved in the process of evolution. What about vultures? Bald? He was born, not plucked his own feathers.
An eagle soaring in the sky
Some people may say,? The eagle plucked its feathers and reborn? The most important thing about a story is the spirit it symbolizes, and the truth of the facts is not so important in it, but what I want to say is that if you regard it as a story, it is understandable, but shouldn't science be about eliminating the false and retaining the true? The spirit conveyed by the story is respectable, but we also need to know the truth behind it. After all, some people believe it.