Why do giraffes have necks that are almost half as tall as themselves?

The long necks of giraffes are obvious to all, and their necks belong to the only creature in the world with such a long neck, which is their representative feature. For the long neck of giraffes, according to Darwin's theory of natural selection, it is because in the past, they were all survival of the fittest, the weak and the strong, and the natural environment changes quickly, if the neck is short, they cannot eat the leaves in high places, so in order to eat more food, their necks are longer and longer, and the short-necked ones are eliminated in the natural environment, and finally become giraffes that are only convenient to bend, and they choose to evolve in order to avoid more fierce competition. In addition, it has now been discovered that giraffes do not all like to eat tall leaves, so the term natural selection is still controversial.

Giraffes have long necks because of love, because they want to capture the heart of female giraffes, so male giraffes undergo physical changes, they continue to evolve, grow long necks to meet their beloved deer, male giraffes prefer to attack each other through their necks and heads, so if the neck has an advantage, it is easier to win. They can also fight other competitors to get a female giraffe option. So it's gender selection.

But only in males, female giraffes do not have an attack and should not have a long neck. So gender selection is currently just a claim that can be easily disproved.

In addition to this, there is also a saying for thermoregulation, which means increasing the surface area of the body to dissipate heat, because there are sweat glands on the neck that facilitate perspiration and create shadow areas. Another idea is that because they need to drink water, because giraffes have long legs, they can't escape from their predators faster when they drink water, so in order to survive better and avoid the consequences of long legs, they have evolved to stand up and drink water with long necks, so they don't have to bend down when drinking water.

There are many theories about the giraffe's long neck, natural selection as well as gender selection, including body heat dissipation and easy to drink water to escape, but after all, there is still no definite secret, and I hope to witness a conclusion in the future.

It is due to the fact that giraffes have mutated genetically in the process of evolution, and have a gene that makes their necks grow, so that they can survive more easily and eat the leaves of the trees in high places.

The reason why the neck of the deer is very long is because the deer needs to rely on its neck to get what it needs, of course, most of the cases are caused by natural factors.

Giraffes have evolved like this because they have to survive in nature and to survive on their own.

The giraffe's long neck is the result of natural selection. The ancestors of the giraffe used their necks more and more developed in the struggle for food, survival and competition, so that the neck of the giraffe gradually became longer and longer as the generations continued. The giraffe's long neck and long legs are good cooling "cooling towers".

They live in hot savannahs, and due to their large surface area, they are conducive to heat dissipation and adapt well to their surroundings. The lung capacity is also large, which is conducive to breathing fresh air and expelling exhaust gases. <

The giraffe's long neck is the result of natural selection. The ancestors of the giraffe used their necks more and more developed in the struggle for food, survival and competition, so that the neck of the giraffe gradually became longer and longer as the generations continued. The giraffe's long neck and long legs are good cooling "cooling towers".

They live in hot savannahs, and due to their large surface area, they are conducive to heat dissipation and adapt well to their surroundings. The lung capacity is also large, which is conducive to breathing fresh air and expelling exhaust gases.

The giraffe's neck is so long is the result of natural selection. The ancestors of giraffes lived mainly by grazing, and in order to survive, they had to feed on the leaves of tall trees, so they had to stretch their necks. As the organs that are often used become more and more developed, the organs that are not used deteriorate, causing the giraffe's neck to gradually lengthen.

At the same time, the ancestors of giraffes lived in the hot grasslands, and the ancestors with long necks had a larger surface area, which was conducive to the dissipation of heat, so as to better adapt to the environment. In this way, the survival of the fittest, the short-necked giraffe ancestors will be eliminated, and the surviving giraffes will all have long necks. <

The giraffe's neck is so long is the result of natural selection. The ancestors of giraffes mainly lived by grazing, and the area where they lived was arid due to changing natural conditions, and in order to survive, they had to stick their necks out to feed on the leaves of tall trees. As the organs that are often used become more and more developed, the organs that are not used deteriorate, causing the giraffe's neck to gradually lengthen.

At the same time, the ancestors of giraffes lived in the hot grasslands, and the ancestors with long necks had a larger surface area, which was conducive to the dissipation of heat, so as to better adapt to the environment. In this way, the survival of the fittest, the short-necked giraffe ancestors will be eliminated, and the surviving giraffes will all have long necks.

Because of the changes in the natural environment, the giraffe has less food, and in order to survive, the giraffe can only raise its head, keep stretching its neck, and try to eat the leaves on the tall trees. Their advantages have been inherited and mutated from generation to generation, until they become the tallest men in the animal kingdom today.

Of course, in addition to this genetic explanation, some scholars have also put forward the theory of "use in and waste out". They point out that since the giraffe often eats leaves from trees with its neck, it has to try to stretch its neck at all times. As the organs that are often used become more and more developed, the organs that are not used deteriorate, so that after many generations, the giraffe's neck slowly grows longer, and finally becomes what it is today.

Introduction

The giraffe, now the tallest animal in the world, is one of Africa's most iconic wild animals. China does not produce giraffes since ancient times, and on September 20 of the 12th year of Yongle in the Ming Dynasty (1414 AD), Yang Min under Zheng He brought back a giraffe to the new king of Banggara (now Bangladesh) Saifudin, and the whole country of the Ming Dynasty was in an uproar.

Because the shape and habits of the giraffe are too consistent with the unicorn described in ancient Chinese books, after further understanding, it was found that the origin of the giraffe is in East Africa, and the local Somali language is called "giri", which is very similar to the unicorn, making the Chinese more convinced that the giraffe is the unicorn.

According to the theory of evolution, long-necked deer can eat the leaves of taller trees, so they have an advantage over short-necked deer, and after a long period of survival of the fittest, they evolved into the giraffe we see today.

Giraffes are the tallest animals on land and are over 5 meters tall. The most conspicuous is its neck, which occupies almost half of its height. 15 million years ago, giraffe ancestors roamed the vast grasslands of Africa like ants, with few distinguishing features other than long necks.

In the process of evolution, organisms will follow the physiological characteristics of useful aspects, and the more and more useful, the useless and useful aspects will tend to degenerate, in theory, most biologists have gained recognition, and at the same time, it can explain the causes of biological characteristics very well, as shown in the figure below, the evolution of animal limbs is so basic in relation to the status of human arms.

They are able to survive on higher branches and get more food, while those with smaller necks begin to shrunk away, which is what we call survival of the fittest! For a giraffe, the brain is about two meters higher than the heart, and the heart must be large and powerful. Only then does the heart have to pump blood under high pressure to reach the brain.

Two male giraffes stand side by side and slam the back of their heads into each other in a duel for the right to mate with the female. Their skulls are very thick, which makes them very good at duels.

Their head is like a powerful hammer that can break the bones of their opponents The mass of a giraffe is simple, you just need to weigh it. But how do you calculate the surface area of a giraffe? The researchers divided the giraffe's surface into four parts:

Head, neck, torso, thighs and calves. If you use a body part regularly, it will become stronger, and if you don't use it regularly, it will become weaker. The skills acquired by an individual can be passed on to the next generation.

The above is a detailed interpretation of the problem, I hope it will help you, if you have any questions, you can leave me a message in the comment area, you can comment with me, if there is something wrong, you can also interact with me more, if you like the author, you can also follow me, your like is the biggest help to me, thank you.

This is because in ancient times, there would often be drought years, so many plants on the ground dried up, and some of the rest were eaten by other animals, so they had no food to eat, and those deer with long necks were able to eat the leaves of the trees in high places, and the deer with short necks died, so there were deer with long necks, and the deer with short necks were eliminated.

As a result of long-term evolution, because giraffes need to eat leaves from high places frequently, their necks will slowly grow longer and longer.

This is planned according to one's own physical characteristics, probably to adapt to the environment in which it is lived.

In the process of their evolution, they want to eat the leaves of trees, and then their necks slowly become longer so that they can survive.

This is the physiological state of the giraffe, and it is the body structure of the giraffe, so the neck of the giraffe will be so long, which is also a natural phenomenon.

Because the giraffe's long neck allows the giraffe to find food very well, if the neck is short, it will not be able to eat food on its own.

Probably genetic, giraffe necks have been exceptionally long since ancient times. So when we see a giraffe, we feel that this animal's neck is really long.