Question 1: How did pigeons find their way? After a series of detailed behavioral experiments in the laboratory, scientists announced that they had clearly proved for the first time that pigeons have magnetic sensing ability, just like a simple magnetic compass, which uses the earth's magnetic field to navigate pigeons, and perhaps other birds and turtles. Dr. Kaddoura Nora, a biologist at the University of North Carolina in the United States, said at Chapel Hill Art College: "There are two main theories about the ability of pigeons to find their way home: one is that pigeons find their way home by smell; The other is that they have a magnetic map in their brains. Our work strongly supports the latter theory. Of course, this theory needs further proof. "This research on pigeons is a doctoral research project in Nora, New Zealand. The report of this study was published in Nature on1October 25th, 165438. The other authors of the research report are Dr. Michael Walker, Dr. Michael Davidson and Dr. Martin Weil from the University of Auckland, New Zealand. Dr Kenneth Roman, a famous professor of biology at the University of North Carolina, said: "This is a fascinating study. In this study, Nora trained some homing pigeons that can respond to magnetic fields. This is an important news in biology, because some people have done many experiments on 10 in the past few years, but they all failed. Nora was the first person to find an effective method. "Nora said that in the experiment, if pigeons accurately find two platforms in a room similar to a tunnel, they will get food as a reward. Under normal circumstances, they will climb to either platform to find food. But when horseshoe magnets are placed above and below the food platform to induce them, these pigeons will find food accurately. The accuracy rate reached 75%. This is much more accurate than their random search for food. Knowing that pigeons can respond to magnetic fields, Nora's next step is to find out where the magnetic field receptors are in pigeons. They first tied a small strong magnet to the pigeons' beaks, and as a result, these pigeons found the wrong platform more than half the time. When they tied a piece of brass with the same weight but no magnetic force to the pigeon's mouth, the result had no effect. Then, they locally anesthetized the pigeon's upper beak and cut off the trigeminal nerve, and found that all these would weaken the pigeon's ability to detect magnetic fields. But when the olfactory nerve that transmits olfactory information is cut off, it will not weaken the pigeon's ability to perceive magnetic field. Through these experiments, Nora thinks that the pigeon's magnetic field perception ability lies in the nose area. Nora said: "In the experiment, we know that pigeons have the ability to recognize magnetic fields. However, this ability can also be weakened in various ways. Now we can say that the pigeon's magnetic field perception ability is in the nose area. "Maybe there is more than one answer. Nora's research results are very convincing, that is, pigeons find their way by the earth's magnetic field. Other research results also show that pigeons may know their way in many ways, because other scientists have made other discoveries. For example, British researchers published a research report in February this year, claiming to have solved the mystery of pigeons identifying their way home. They think that the secret of pigeons finding their way home is actually very simple and direct. Like other birds, they often fly along artificial shipping and aviation signs such as roads, railways and canals, and finally reach their destinations. This study was conducted by a zoologist at Oxford University. They studied the homing of pigeons in 65,438+00 years. In the last year and a half, they tracked the flight path of birds with the most advanced global positioning technology, with an error of 1 ~ 4 meters. Researchers in the Department of Zoology of Oxford University said that after more than 65,438+00 years of international research, it was really surprising to find that pigeons did not seem to rely on their innate instinct to tell directions, but flew according to the road system. If it is a long-distance flight or the first flight, pigeons will use their directional nature to identify their orientation according to the sun and stars. But as long as it flies once, the pigeon will fly back according to the familiar route, much like people driving or walking home after work. The researchers said: "Some people may think that this matter is trivial, but it is very important for us, because it will involve the memory structure of birds and what the map looks like in the eyes of birds." However, this research result has caused controversy among some bird research experts, who insist that pigeons use the sun or geomagnetic induction to determine their direction and fly to their destination. Wilzko, a flying pigeon expert at Frankfurt University, expressed doubts about this study at Oxford University. His research shows that pigeons use the sun and geomagnetic field >>

Question 2: How do pigeons find their way home? Several coils are wound around the head and neck of the pigeon, which is powered by a small battery, so that a uniform additional magnetic field is generated at the working part of the pigeon. On a cloudy day, I adjusted the current to flow clockwise, and I found the released pigeons flying in all directions, which shows that the earth's magnetic field is the pigeon's navigation compass. So how do pigeons determine their flight direction according to the earth's magnetic field? According to the book, if a pigeon is regarded as a semiconductor with a resistance of 65,438+0,000 ohms, when it spreads its wings and flies in the earth's magnetic field, it will cut the magnetic field induction line, thus generating induced electromotive force between its wings. Pigeons fly in different directions, and the induced electromotive force is different because of the different cutting lines. The sensory organs in pigeons can judge the opposite direction of flight according to the induced electromotive force.

What about flying on a sunny day? On a sunny afternoon, we did another experiment. This experiment shows that the extra magnetic field has no effect on it, and pigeons can still fly home. This fact shows that the earth's magnetic field is not its only navigation compass. It turns out that pigeons can detect polarized light. On sunny days, they can choose a specific flight direction according to the position of the sun, and the internal biological clock will correct the movement of the sun accordingly.

My uncle asked me to do another experiment: What happens when the current is adjusted to flow counterclockwise? I found that whether it is sunny or cloudy, as long as the current is adjusted to flow counterclockwise and the pigeon is taken to other places to fly, it can fly home.

Besides pigeons, what other animals can detect the earth's magnetic field? With my father's encouragement, I read a lot of books. Beetles, bees, flies, fish, termites and other animals also have this ability. Animals in nature have many superb skills. Studying their characteristics and understanding their principles is very helpful to the improvement of human technology.

Question 3: How do pigeons find their way? Everyone knows the amazing ability of homing pigeons to tell directions. There are four reasons. Carrier pigeons have a strong memory for terrain. B. homing pigeons can emit and receive some kind of ultrasonic waves. C. homing pigeons can send and receive certain infrasound waves. D. There is a magnetic substance in the homing pigeon, which can be used to tell the direction. The physical problems involved are: ultrasound, infrasound, geomagnetic field, magnets and so on. Finally, the pigeon with a small magnet is disoriented because it is in the strong magnetic field of the magnet, which interferes with the magnetic substance in its body, thus losing its ability to tell the direction. Copper blocks are not magnetic and will not interfere with the magnetic substances in pigeons. Therefore, scientists' experiments support conjecture D.

Question 4: Why do pigeons know the way? Five points. There is a tissue in the pigeon's brain that senses the geomagnetic field, which is more powerful than ordinary birds. Therefore, it can achieve the amazing ability of the destination homing pigeon to distinguish the direction from a distance under a small gap. Everyone knows the reason is that there are four messages. Pigeons have a good memory for terrain. B. Pigeons can emit and receive some kind of ultrasonic waves. C. Pigeons can send and receive certain infrasound waves. D. Pigeons have some magnetic substances in their bodies, which can be used to tell the direction. The physical problems involved are: ultrasound, infrasound, geomagnetic field, magnets and so on. , all from the textbook "high starting point and low ground". Finally, the pigeon with a small magnet loses its way because it is in the strong magnetic field of the magnet, which interferes with the magnetic substance in its body and thus loses its ability to distinguish its direction. Copper blocks are not magnetic and will not interfere with the magnetic substances in pigeons. Therefore, scientists' experiments support conjecture D.

Question 5: How did ancient homing pigeons find their way? The letter is tied to the pigeon's feet, and it is delivered by using the principle that the pigeon can know how to fly home.

A homing pigeon, even if you take it to a strange place thousands of miles away, it can take the letter home. Several coils are wound around the pigeon's head and neck, and a small battery is used to supply power, so that a uniform additional magnetic field will be generated on the pigeon's head. When the current flows clockwise, pigeons flying on cloudy days will fly in all directions. This shows that pigeons navigate by geomagnetism.

Some people regard pigeons as semiconductors with a resistance of1000Ω. When it flaps its wings in the earth's magnetic field, the wings cut the magnetic field lines, thus generating induced electromotive force (i.e. induced voltage) between the wings. Pigeons fly in different directions, because the direction of cutting magnetic field lines is different, so the magnitude of electromotive force can tell the direction. However, the test shows that the additional magnetic field does not affect its flight when it is released in sunny days, which shows that geomagnetism is not its only compass. It turns out that pigeons can measure polarized light. On sunny days, they can choose the flight direction according to the position of the sun, and the movement of the sun is correspondingly corrected by the internal biological clock. It must be pointed out that when the current flows counterclockwise, it can fly home whether it is sunny or cloudy.

Question 6: Why can pigeons find their way home? Pigeons know their direction not by their eyes, but by the earth's magnetic field. Some people regard pigeons as semiconductors with a resistance of1000Ω. When it flaps its wings in the earth's magnetic field, the wings cut the magnetic field lines, thus generating induced electromotive force, that is, induced voltage, between the wings. Pigeons fly in different directions, because the direction of cutting magnetic field lines is different, so they can distinguish the direction according to the magnitude of electromotive force. When flying in sunny days, the additional magnetic field does not affect the flight of pigeons, which shows that geomagnetism is not its only compass. In fact, pigeons can choose the flight direction according to the position of the sun on a sunny day, and the internal biological clock also corrects the movement of the sun accordingly. However, when encountering thunderstorms or TV towers, homing pigeons may be unable to distinguish the direction of the earth's magnetic field because of the interference of the geomagnetic field in these areas, resulting in getting lost.

Question 7: Enlightenment of Pigeons Knowing the Way Two little pigeons, sometimes their mother told them to go to the little pigeon today, but one day when the little pigeon was practicing flying, she accidentally fell from the sixth floor and died, like a big bag on her pointed mouth. My heart is as sweet as drinking honey, and the little pigeons are cooing. * Lovely pigeons! There are a pair of lovely pigeons in my home! The whole body is white and shiny, and the whole body is like the capital English letter "C". During the day, they always want to fly into the sky. I go to grandma's house for dinner. Their hair is light and their legs are short. They have a special and obvious nose. Look at them, fighting for each other, suddenly flying down and seeing the corn in my hand, goo goo. Once my uncle took us to feed pigeons in Xincheng Square, pecked the corn in my hand and found that they had a new pet! We should love small animals in the future. Sometimes, it is really cute, shining in the sun! I was impressed at that time. My eyes are black and bright, and my hands are itchy, but it can still understand us. It really hurt, so I went to feed them, and the pigeons cooed. Their ears could not be smaller, and the pigeons immediately jumped to the ground to peck at the corn. The hair on their necks is particularly beautiful. Its feet are strong and its mouth is sharp? They don't like cleanliness very much. Watching them eat so happily, walking like a general, feeling warm, with red toes and three feet moving forward. My brother told me that there were three pigeons. In the afternoon, one fell behind! "Kid, I thought they were hungry, so I threw the corn on the ground. I feel sorry for this little pigeon. I always observe the movement around me and hold it in my hand: "I'm hungry. "It also has a pair of black eyes, wings like two small fans, just don't go! I'm hungry. Pigeons have to eat when they get up early in the morning. I wonder if corn is so delicious, as if to say, is my pigeon interesting?