The relationship between bats and radar

Bats are the only mammals that have evolved real flying ability, with more than 900 species. Most of them also have keen auditory localization (or echolocation) systems. Most bats feed on insects. Because bats prey on a large number of insects, they play an important role in the balance of insect reproduction and may even help control pests. Some bats also eat fruit, pollen and nectar; Vampire bats in tropical America feed on the blood of mammals and large birds. These bats sometimes spread rabies. Bats are distributed all over the world. In the tropics, bats are extremely abundant, and they will be integrated into large groups in people's houses and public buildings. Bats vary greatly in size. The largest blood-sucking flying fox has a wingspan of 1.5m, while Kitty's pig-nosed bat has a wingspan of only 15cm. Bats vary greatly in color, fur texture and facial appearance. The wings of bats evolved from forelimbs in the process of evolution. Each finger of the forelimb is extremely elongated except the thumb, and there is a flying membrane connecting the forearm and the upper arm down to the side of the body until the ankle of the lower limb. There are claws at the end of the thumb. Most bats also have two membranes between their legs, consisting of dark and bare skin. Bats have noses like rodents or foxes. The outer ear protrudes forward, usually very large and elastic. Many bats also have nasal lobes, which are composed of skin and connective tissue and flap around or above their nostrils. It is believed that the alar affects vocalization and echolocation. Bats have short necks; Broad chest and shoulders, developed chest muscles; And the hips and legs are slender. Except for the wing membrane, bats have hair all over their bodies, and their backs are gray, brown, brown or black with different shades, and their bellies are lighter in color. Bats living in open areas often have spots or mottled patches on their fur, and their colors are also different. Bats have different food habits, or prey, or help pollinate and spread fruits, thus affecting the natural order. Vampire bats are a serious problem for human beings. The excrement of insect-eating bats is used as fertilizer in agriculture. The sexual cycle of the whole bat population is synchronous, so most mating activities take place within a few weeks. The gestation period is from June to July. Many kinds of female animals will move to a special habitat after pregnancy. Bats usually give birth to 1 to 4 cubs per litter. Babies are born hairless or hairless and often cannot see or hear for a period of time. Babies are cared for by their parents for 5 weeks to 5 months, depending on different species. Almost all bats rest during the day and go out for food at night. This habit makes it easy for them to attack sleeping prey without being hurt by other animals or high temperature sunlight. Bats usually like to live in isolated places, such as caves, cracks, holes or buildings, and some live in trees and rocks. They always rest backwards. They usually gather in groups, ranging from dozens to hundreds of thousands. Bats with echolocation ability can produce short and high-frequency sound pulses, which will be reflected when they meet nearby objects. Bats can determine the location and size of prey and obstacles when they hear the reflected echoes. This skill requires a close combination of highly sensitive ears and vocal centers with auditory pathways. Individual bats can also communicate with each other in the form of sound pulses. A few bats rely on smell and vision to find food. Although they have all-purpose glue, they look like birds. But they have no feathers and don't lay eggs. They are mammals: females give birth to young and feed them with milk.

Some kinds of bats are masters of flying. They can turn around quickly in a narrow place. Bats are the only mammals that can fly with wings. Other flying mammals, like flying squirrels, just glide in the air by wing-shaped membranes!

At night, bats rely on Pippo to explore and hunt. They emit sound waves that humans cannot hear. When the sound wave meets an object, it will return like an echo, so that bats can tell whether the object is moving or stationary and how far it is.

Long-eared bats prey on flying insects and can also catch insects from leaves. Its big ears enable it to receive echoes.

Bats eat everything; Including fruits, fish, pollen and even blood. Most bats prey on insects when flying at night, and each bat can distinguish its own sound waves, indicating that even if they prey with other bats, they will not be disturbed by other sound waves.

People often use the word "birds and beasts" to describe birds and mammals, but this statement is sometimes not necessarily correct, because some birds can't fly, such as ostriches, emus, kiwis and penguins. There are also some mammals that can't walk, such as whales living in the ocean. Bats can't walk on the ground like ordinary terrestrial mammals, but they can fly in the air like birds.

Bats are the only animals that can really fly. Although they don't have the feathers and wings like birds, and their flying ability is much worse than that of birds, their forelimbs are very developed, and their upper arms, forearms, metacarpals and phalanges are particularly long. From the end of phalanges to the humerus, sides, hind legs and tail, a thin and hairy soft and tough skin membrane is supported, forming a unique flying organ of bats-pterodactyl. There are also records about bats in ancient China, saying that they also lived in stalactite caves called fairy rats. Bats there can live forever because they can drink water from caves. After thousands of years, their body color has also changed greatly, from the initial dark color to white. I think that's why they are called fairy rats.

Bats have well-developed pectoral muscles, keel-like processes in sternum and well-developed clavicle, all of which are related to their special sports methods. It can fly well, but it needs to glide when it takes off, and it is difficult to fly again once it lands. When flying, the hind legs extend backwards to balance.

Bats generally have the habit of hibernating. During hibernation, their metabolic ability is reduced, their breathing and heartbeat are only a few times per minute, their blood flow is slowed down, and their body temperature is reduced to be consistent with the ambient temperature. However, their hibernation is not deep, and they sometimes excrete and eat during hibernation, and they can return to normal immediately after waking up. Their fertility is not high, and there is a phenomenon of "delayed fertilization", that is, fertilization does not occur during mating before hibernation, and sperm spend the winter in the female reproductive tract. After waking up in the next spring, the mating females begin to ovulate and fertilize, and then get pregnant and give birth.

Bat is an ancient and specialized branch of mammals, named after its forelimbs have special wings. It is distributed all over the world except the North and South Poles and some ocean islands, with the most species and quantities in tropical and subtropical regions. Because of their ugly appearance and nocturnal habits, they always make people feel terrible. The original meaning of their names in foreign languages is frivolous mice. But in China, because the word "bat" is homophonic with the word "fu", it can still be loved by people, and its image is painted on New Year pictures.

There are more than 900 species of bats in the world, and there are about 8/kloc-0 species in China, which is the second largest mammal group after rodents. It can be roughly divided into two categories: big bats and small bats. Bats are distributed in tropical and subtropical regions of the Old Hemisphere. They are large in size and primitive in body structure, including Muscidae, 1. Small bats are distributed in tropical and temperate regions of the Old Hemisphere and the Western Hemisphere. They are small in size and have more specialized body structures, including more than ten families, such as Batidae, hipposideridae, Batidae, Haemophagidae and Batidae.

[Edit this paragraph] The feeding habits of bats

Bats have various eating habits. Some species like nectar and fruit, others like to eat fish, frogs and insects, suck animal blood and even eat other bats. Generally speaking, big bats generally feed on fruits or nectar, while small bats mostly prey on insects.

Bats that feed on insects have echolocation systems to varying degrees, so they are called "live radars". With the help of this system, they can fly and catch food in complete darkness, use echolocation under a lot of interference, and send out ultrasonic signals without affecting normal breathing. There are structures called "nasal lobes" on the nose and mouth of their heads, and there are complex special skin folds around them. This is a peculiar ultrasonic device, which has the function of emitting ultrasonic waves and can continuously emit high-frequency ultrasonic waves. If you encounter obstacles or flying insects, these ultrasonic waves can be reflected back and then received by their extraordinary big auricles, so that the feedback information can be analyzed in their tiny brains. This kind of ultrasonic detection has high sensitivity and resolution, so that they can not only identify the direction and locate their own flight path according to the echo, but also identify different insects or obstacles for effective avoidance or pursuit. Bats can fly freely in the air with accurate echolocation and incomparably soft skin membrane, and even fly in a dexterous curve, constantly changing the direction of ultrasonic waves to prevent insects from interfering with their information systems and trying to escape.

Like other animals, many bats are becoming less and less in nature and tend to be extinct. Poisons and wood protectants used to kill insects kill them during hibernation, and many wrong ideas also make humans kill them in large numbers. Some kinds of hollow trees were cut down, and the ruins were torn down or rebuilt tightly, so they could not survive. Bats play an important role in maintaining the ecological balance of nature. All kinds of insect-eating bats can kill a large number of mosquitoes, moths, scarabs, nuns and other pests, and can prey on more than 3000 in one night, which is beneficial to human beings. The excrement collected by bats is also good fertilizer, which is very useful for agricultural production. The processed bat dung is called "night sand" and is a traditional Chinese medicine. Bat is still an important object to study the orientation, location and dormancy of animals, and the secret of its radiation technology has not been fully understood. Humans only know what bats can do, but they don't know how they do it, so it is imperative to save those endangered species.

With the help of bionics principle, human beings made radar according to the echolocation system of bats.

Little knowledge:

1 There are many kinds of bats, about 900 species in the world. The species and number of bats rank second among mammals, second only to rodents.

The wingspan of a small bat with a pig nose is only 1.4 cm, and the wingspan of a flying fox with a body as big as a puppy is 2 meters wide.

Some bats can fly at a speed of more than 50 kilometers per hour.

Bats can capture and distinguish 250 sets of echoes in 1 second. (Note: One round trip of sound waves is counted as one group. )

Since autumn, a layer of fat has accumulated in the lower abdomen of bats, and their weight has become more than 1.5 times that of summer before hibernation.

Some bats can fish, and Mexican harelip bats can catch more than 30 small fish in one night.

An insect-eating bat weighing 20 grams can eat 1.8-3.6 kilograms of insects a year.

Bionics of bat colony composed of 100 bats

Bionics is a word formed by adding ics with engineering significance to the Greek bion with life significance. I started using it around 1960. The function of biology is far superior to any artificial machinery, and bionics is a subject to realize and effectively apply biological functions in engineering. For example, information reception (sensory function), information transmission (neurological function), automatic control system, etc. The structure and function of this organism give great inspiration to mechanical design. Examples of bionics can be cited, such as applying the body shape or skin structure of dolphins (which can prevent turbulence on the body surface when swimming) to the design principle of submarines. Bionics is also regarded as a discipline closely related to cybernetics, which mainly compares life phenomena with mechanical principles and studies and explains them.

Flies are the disseminators of bacteria, and everyone hates them. The wings of flies (also called balance bars) are "natural navigators", and people imitate them to make "vibrating gyroscopes". At present, this instrument has been applied to rockets and high-speed aircraft, realizing automatic driving. The fly's eye is a kind of "compound eye", which consists of more than 3000 small eyes. People imitate it and make a "fly-eye lens". The "compound eye lens" is composed of hundreds or thousands of small lenses arranged in sequence. It can be used as a lens to make a "compound eye camera" and can take thousands of identical photos at a time. This kind of camera has been used for printing plate making and copying a large number of tiny circuits of electronic computers, which greatly improves the work efficiency and quality. "Compound eye lens" is a new type of optical element, which has many uses.

What strange skills do all kinds of creatures in nature have? What inspiration did their skills give to mankind? What kind of machines can humans build by imitating these skills? Here is a new science-bionics.

Bionics refers to the science of imitating organisms to build technical devices, which is a new frontier science in the middle of this century. Bionics studies the structure, function and working principle of objects, and transplants these principles into engineering technology to invent instruments, devices and machines with superior performance and create new technologies. From the birth and development of bionics to just a few decades now, its research results have been very impressive. The advent of bionics has opened up a unique road of technological development, that is, the road of asking for blueprints from the biological world, which has greatly broadened people's horizons and shown great vitality.

Bats usually mate before 10 months. Sperm overwinters in female body, pregnant in winter and pregnant for 2 months. Give birth to 2 calves at a time and breast-feed for 20 days. Hibernation lasts for 4 months, 1 1 enters hibernation. Bats can't take off on flat ground, so there must be a height difference.

The navigation ability of bats is not limited to echolocation. It has a magnetic "compass" navigation function, which can accurately return to its habitat from thousands of miles away according to the earth's magnetic field.

Previously, as we all know, bats are famous "night rangers". Although its eyesight is poor, it has an extraordinary echolocation method and can still navigate and forage in the dark.

Flying thousands of miles will not "go astray"

Richard Holland, a biologist at Princeton University in New Jersey, USA, and his colleagues found that when bats are in an artificial magnetic field environment, they will interfere with their original correct course and make bats "go astray". This study is the first time that scientists have revealed that bats have the ability of magnetic navigation, which is helpful to further enhance scientists' understanding of bat navigation flight.

Bats that are good at flying at night have unique echolocation ability. By emitting high-frequency sounds and judging the position and distance of objects according to the echoes, this ability can help bats accurately judge the position of their prey and effectively bypass trees and buildings. According to this theory, the echolocation function of bats can be easily used for short-distance flights, but for long-distance flights, bats with very poor eyesight seem to have nothing to do.

At present, Holland's research overturns this misunderstanding. He pointed out that bats have magnetic induction ability and can still accurately judge the direction when flying thousands of miles away. This ability of bats is similar to that of some birds. Except for the magnetic field, the setting sun is the direction indicator. This will help to adjust the "compass" in animals and effectively distinguish the difference between the north direction and the true north direction of the magnetic field. Holland said, "This study has further enhanced our interest in the in-depth study of bats. Originally, we thought that bats could fly only a few miles at the farthest, but in fact they have something in common with migratory birds and can fly thousands of miles. "

Navigation according to the earth's magnetic field and sunset direction

In the research experiment, Holland led the research team to install a miniature radio transmitter on the body of the big brown bat, and then released it from their habitat 12 miles north. In the process of bats returning to their habitat, the research team monitored them over the bats by a small plane. Some bats that are not disturbed by artificial magnetic fields, based on the ability to recognize the sunset magnetic field, fly south and easily find their hometown.

However, before this, the research team released two groups of bats, which were in the artificial magnetic field environment of 90 degrees clockwise and 90 degrees counterclockwise in the north pole of the earth's magnetic field. Bats flying in a 90-degree counterclockwise magnetic field have been flying westward; The other group was disturbed by a 90-degree clockwise magnetic field, but they kept flying eastward. But these bats almost lost their way and used the sunset as a direction marker. Finally, they realized that the flight direction was wrong and changed their flight direction to return to their habitat smoothly.

Bats have magnetite in their bodies and will have a nervous attack.

At present, scientists know that animals in nature are mainly divided into two kinds of magnetic sensory orientation: one is a simple "compass" sensory function, based on the reaction between magnetite particles in the body and the external environment; The other is that some birds can accurately judge the flight direction according to the magnetic field intensity they "see" in different positions of the earth's magnetic field.

[Edit this paragraph] The medicinal value of bats.

It can be used as traditional Chinese medicine for chronic cough, malaria, gonorrhea, nebula, etc. Its feces is also a kind of Chinese medicine called Yemingsha, which is used for eye diseases.

"Bao Puzi" said: "The chitose bat is as white as snow, but its set is upside down and its brain is heavy. If you get it and put it in the shade at the end, it will be a long life. Wu's Materia Medica also said that bats "die in the shade in the long summer, which makes people see at night", and even said that bats "take it and serve it, so that people don't die".

A cave was found on the hillside of Huangjiagou, Guangou Village, Shuanglong Town, Xixia County, Henan Province. There is a century-old bat dung with medicinal value in the cave-"Yesha" cave is more than 600 meters deep, 15 meters wide and 40 centimeters narrow. In the cave, three or five groups of bats hang on the stone wall, and their excrement has accumulated nearly two meters thick and the color is like dark brown soil. According to reports, bat dung has the functions of clearing heat, improving eyesight and removing fire. After years of accumulation, its medicinal value is higher. According to experts' calculation, these bat droppings, which are called "luminous sand" in medicine, have a history of at least 100 years and weigh about 80 tons, which is rare in China.

From Shennong Herbal Classic;

1. Tang herbal medicine: Fuyi, with wings during the day. "Li Bencao" cloud, that is, rats are also. There is another cloud: there are no voles in Xiping Mountain, and they will be taken in November and December. Its brain dominates women's facial blisters.

2. "Outline": The compilation is characterized by diarrhea, and the prescription for treating golden sores is beneficial, and its toxicity is known.

[Edit this paragraph] Bats are not born with sonar.

A few days ago, American researchers found that bats were not born with the ability to locate, prey and sail by sonar. The research team reached this conclusion by analyzing the oldest bat fossil discovered so far (about 52 million years ago). They analyzed its skeletal fossils and found that this bat has highly developed wings, but found no sign that it has the ability to emit sound waves. The researchers said that the research on bats will continue, but this discovery at least solved a long-standing debate in the scientific community. Can bats use sonar or fly first? The obvious answer is to fly first.

Spalla Jay's Bat Experiment

1793 One night in the summer, Italian scientist Spalla went out and put some bats in cages to do experiments. I saw the bat shaking its limbs with film, flying lightly into the night sky and making a free "squeak" cry ... Spalla Jie was puzzled after seeing it, because before he released the bat, he had blinded the bat's eyes with a small needle. "How can a blind bat fly so fast?" He made up his mind to solve the mystery.

Before this experiment, Spalla Jay always thought that bats could fly freely in the night sky and avoid various obstacles to catch flying insects in very dark conditions. It must be because of a pair of very keen eyes. The reason why he wants to blind bats is to prove it. The fact was completely out of his expectation.

This unexpected situation aroused his curiosity even more. "Without eyes, how can bats identify obstacles and catch food?" So he blocked the bat's nose again and let it out. As a result, the bat flew easily. "Will the mystery be on the wings?" Spalla Jay painted a layer of paint on the bat's wings this time. However, this did not affect their flight at all.

Finally, Spalleger plugged the bat's ears again ... This time, the bats flying in the sky bumped into each other and fell down quickly. Spalla Jay just figured it out. It turns out that bats rely on hearing to determine their direction and capture their targets. A * * * did four experiments.

Spalleger's new discovery caused people's shock. Since then, many scientists have further studied this subject. Finally, people finally figured out that bats use "ultrasound" to navigate at night. The high-frequency sound waves emitted by its throat are inaudible to human ears. This sound wave travels in a straight line and returns as soon as it touches an object. They use their ears to receive the returned ultrasonic waves, so as to make accurate judgments and guide them to fly.

The scientific principle of "ultrasound" has been widely used in navigation, navigation and medicine.

"Real-time Radar" in Flight

Bats are good at flying in the air, and can do "aerobatics" such as turning around, braking suddenly and changing flight speed quickly. Bats, hiding in caves, tree holes or cracks in eaves; Flying in the air at dusk and night, preying on mosquitoes, flies, moths and other insects. Bats prey on a large number of pests, which are beneficial to people and should be protected.

In summer, the female bat gives birth to a fully developed larva. The newborn baby is covered with fluff, and its claws are firmly hung on its mother's chest to suck milk, so that it will not fall off when her mother flies.

The wings used by bats to fly. The structure of wings is different from that of birds, which is composed of skin membranes connected between forelimbs, hind limbs and tails. The second, third, fourth and fifth fingers of the forelimb are particularly long and suitable for supporting the skin membrane; The first finger is very small and grows outside the skin membrane, and there are claws at the end of the finger. The hind legs are short, with five toes and claws on the toes. When resting, I often hang my body upside down in a cave or under the eaves with my claws. When crawling on trees or the ground, grab rough objects with your forefinger and feet and move forward. Bat's skeleton is very light, with a protuberance on the sternum similar to the keel process of birds and muscles that affect the movement of its wings.

Bats have wide mouths and small sharp teeth, which are suitable for catching flying insects. Its vision is weak, but its hearing and touch are very sensitive. Some experiments have proved that bats find insects mainly by hearing. When a bat flies, it can produce ultrasonic waves in its throat and emit them through its mouth. When ultrasonic waves are reflected by insects or obstacles, bats can receive them with their ears, and they can judge whether the detection target is insects or obstacles and how far it is. People usually call this way of bat detecting targets "echolocation". The signals emitted by bats during foraging, orientation and flight are composed of ultrasonic phonemes similar to language phonemes. Bats can only decide what to do next after receiving the echo and analyzing its acoustic characteristics such as amplitude, frequency and signal interval.

Bats rely on echo ranging to locate, and only send out a simple sound signal, which usually consists of one or two phonemes that appear repeatedly according to certain rules. When a bat is flying, the signal it sends out will be bounced by the object, forming echoes with different sound characteristics according to the nature of the object. Then the bat determines the nature and position of the object after analyzing the acoustic characteristics such as frequency, tone and interval of the echo.

Different parts of the bat brain can intercept different components of the echo signal. Some neurons in the bat brain are sensitive to the echo frequency, while others are sensitive to the time interval between two consecutive sounds. The cooperation of all parts of the brain enables bats to judge the characteristics of reflected objects. The flexibility and accuracy of bats in catching insects by echolocation are amazing. According to statistics, bats can catch an insect in a few seconds and a dozen insects in a minute. At the same time, bats also have amazing anti-interference ability. They can detect a special sound from the chaotic echo full of noise, and then quickly analyze and distinguish this sound to distinguish whether the object reflecting sound waves is an insect or a stone, or more accurately determine whether it is an edible insect or an inedible insect.

Twenty thousand bats live in the same cave and will not interfere with each other because there are too many ultrasonic waves in space. The accuracy and anti-jamming ability of bat echo positioning have important reference value for people to study and improve the sensitivity and anti-jamming ability of radar.

[Edit this paragraph] The symbolic meaning of bats

Bat mammals. Also known as fairy mouse and flying mouse. It looks like a mouse, and its front and rear limbs are connected with the body by a film. It flies at night and preys on mosquitoes, ants and other small insects. (Tang) Yuan Zhen's poem "Long and Beautiful Mid-Autumn Festival": "The curtain breaks the firefly, and the window shows the bat flying." Bat province is called "Bat". Because "bat" and "fu" are homophonic, people use bats to express auspiciousness, which is auspicious. There are five bats in a folk painting called five blessings. In the past, there were often bat patterns on silk brocade. The velvet flowers worn by women at weddings and birthday banquets (such as "Five Bats Holding a Birthday") and some costumes and utensils are also commonly used in bat modeling. Feng Menglong's Laughing Room. Bat riding on the wall: "Phoenix celebrates its birthday, but bats don't come." It says it is not a bird, but a quadruped. Later, it was Kirin's turn to celebrate his birthday. All the animals came to congratulate him, but the bat didn't come. This time it says it has wings and can fly. It is a bird, not a beast. This joke satirizes the bat as a cunning fence-sitter. People in Jingpo generally believe that bats are a symbol of cunning. According to legend, in ancient times, the temperature of the sun was very high, and the animals on the ground were baked unbearable and cursed one after another. The sun was very angry and turned to heaven. From then on, the world was dark. So all the animals got together and agreed to raise some gold and silver to invite the sun out. When the bird raised money from the bat, the bat folded its wings and said that it was not a bird, but a mouse and did not want to donate. The mouse found it, patted its wings again and said it was a bird, not a mouse, and didn't donate money. So the bat didn't even donate a penny. Therefore, Jingpo people call those who are duplicitous, improvise, face to face, and behind their backs "bats". (Wang Ruohui, Zhao Jie)

Gong said: In China culture, bats are definitely a symbol of "happiness", which can be found almost everywhere in many preserved ancient buildings, brick carvings and stone carvings. Needless to say. But if people are called bats, there is no auspicious meaning in them. The legend above has made it very clear.

China symbolic culture 65438+ 13/000

[Edit this paragraph] The opera "Bat" of the same name

A three-act comedy opera based on the German writer Benedict's comedy Prison, created by French Meyer and Allevi. The manager of Vienna Theatre bought the script of Eve, asked hafner and Niet to adapt it into a three-act German operetta script suitable for performing in Vienna, and asked the German composer Richard Strauss to create the three-act operetta Bat. 1On April 5th, 874, the play premiered in Vienna Theatre.

"bat" (Die Fledermaus；; Bat is a Viennese operetta written by Johann Strauss II, the "king of waltzes" (1825- 1899). Not Richard g Strauss (1864).

[Edit this paragraph] Classical Chinese

Phoenix is alive, birds meet him, bats don't come. Feng scolded, "Why are you proud to live under my command?" The bat said, "I've had enough. I belong to the beast. What's the use of congratulations? " One day, the unicorn was born and the bat didn't come. Lin is also responsible for this. The bat said, "I have wings and belong to birds." How can I congratulate you? " When Lin and Feng met, they talked about bats and sighed with each other: "This world is evil and thin, and it is really helpless to have this migration!"

-"Laughing House"

[Notes]

(1) in (u) proud-arrogance.

(2) birthday-here refers to the birthday.

③ and (y ú)-modal particles at the end of the sentence, expressing doubt.

4 evil thin-bad shallow, refers to the social atmosphere.

Translation:

Phoenix is the king of birds. On Phoenix's birthday, all the birds came to congratulate him, but the bat didn't appear. Phoenix stopped it and reprimanded it: "You are under my jurisdiction, how dare you be so arrogant!" " The bat stamped his foot and said, "I have animal feet. I am a citizen of the animal country." "Can your bird country manage me?" A few days later, Kirin celebrated her birthday. Kirin is the king of beasts. All the animals came to celebrate their birthdays, but the bats still didn't show up. Kirin stopped it and reprimanded it: "You belong to my jurisdiction, how dare you be so presumptuous!" " The bat flapped its wings and said, "I have wings and am a citizen of the country of birds." "Your animal kingdom is too wide!" One day, Phoenix and Kirin met. When it came to the bat, it realized that it was lying on both sides. Phoenix and Kirin shook their heads and said with emotion, "The current atmosphere is too bad. It happened that these guys who were neither birds nor beasts were born, and there was really no way to do anything with them! "

[hint]

People still often regard two-faced people as bats. These people, have it both ways, make ends meet, constantly changing their principles and positions, trying to make profits through speculation. However, they can only succeed for a while, and one day they will show their ugly faces and be spurned.