Why do the swallows that are common in the countryside never land on trees, but only on power lines?

In the countryside, among all the animals, the swallow is one of everyone's favorite animals, also called the auspicious bird, the Angelo, the little swallow settled in which house, is the representative of good luck, as the saying goes, "the little swallow does not go out of the cold and bitter door" is the same beautiful meaning, so adults have been educating children, do not hurt the little swallow, do not have to poke the swallow's nest. Swallows can also sometimes land on trees, and the probability of landing only in the cable is higher than in the tree, which has a certain influence on factors such as its body structure and instinctive reactions. You must know that its sailing ability is very good.

The frequency of falling under the navigation condition is also very small, because its front paws are small and short, not suitable for falling on thick branches, and the surface of the cable is smooth and moderate, which happens to be the ideal focus point of the little swallow, the layout of the cable is generally very high, and it also has a wide line of sight that stands high and long, and in turn the flowers and trees are very easy to block the vision of the little swallow. Another point is the principle of the little swallow's distance, the little swallow likes to build a nest in the eaves, and most of the houses in front of the house are full of wires and cables, so it is convenient to stop on the cable line to watch their own caves.

And then there is a certain sense of belonging to the cable line. It is indeed very rare to find the scene where the swallow will stand on the tree, many times people are the most likely to find the little swallow on the cable line in the countryside, the small swallow on the cable line is stacked on top of the mountain, it is like the stave that everyone knows, the little swallow loves to stay on the cable, why not like other birds, love to fall on the tree? In fact, this is also due to the composition of the body structure of the little swallow, which makes the little swallow very unsuitable for landing on the branches of the deciduous tree skill onion cage.

The main reason is that the feet of the little swallow are too slim, and it is difficult to take off on the spot with the help of the energy of the feet during the flight. If you look closely, you will find that there are many differences between the little swallow and other birds, first of all, the place where it lives, the little swallow likes to make a nest in the farmer's house or eaves; secondly, the little swallows like to stay on telephone poles, and often in groups of three or five; In the end, most of the villagers felt that the swallow was an "auspicious bird", and they looked forward to the frequent visit of the little swallow in their home, which was incomparable to other birds.

The main thing is that the body of the swallow is relatively light, and there will be a lot of leaves when it falls on the tree, and it is easy to cause the light swallow to fall down when it takes off. On the wire, since the swallow is not a conductor, it will not be electrocuted, and the wire is relatively empty.

Because swallows have weak leg strength and too many leaves on trees are not conducive to frequent flights, they generally choose bare wires.

Many times, we are most likely to find swallows on power lines in rural areas. The swallows on the wires are randomly arranged, much like the staff we are familiar with. Swallows love to stay on power lines, so why don't they fall on trees like other birds?

In fact, swallows sometimes fall on trees, but the probability of falling on power lines is higher than that of trees, which has a certain relationship with its body structure and instincts. You must know that its flight ability is quite powerful, and the number of times it lands during the flight is relatively small, because its claws are small and short, which is not suitable for landing on thick branches, and the surface of the wire is smooth and the thickness is moderate, just right. This is an ideal place for swallows to stay.

The wiring is generally high, and it also provides a wide field of view when viewed from a high vantage point. On the contrary, trees can easily block the view of swallows. In fact, this is caused by the composition of the swallow's body structure.

This combination of body structures makes swallows very unsuitable for perching on trees with dense foliage and branches. The main reason is that the swallow's legs are too thin to take off. Rely on the strength of your legs to kick into position and take off.

Not only do swallows rarely land on trees, but even ground swallows rarely land on trees. It is only when some nests are built that they need to go to the ground to find something to build a nest in. Swallows stand on trees, dense leaves and branches can affect swallows take off, swallows can easily collide and fall, swallows stand on power lines or open places, swallows can fly with the wind.

This is also due to the swallow's body structure. Just like some other birds, geese and swans, they also need to run when taking off, which is a necessary take-off condition caused by the body structure. Under the big trees, swallows rarely choose to settle down.

The swallow stood tall on the power line and looked down. Once they find their prey, they can take off and glide quickly and hunt at high speed and accuracy. Such favorable conditions are more suitable for swallows to hunt, so swallows like to stand on power lines.

Swallows are also afraid of eating. Standing at a high altitude, they have a wider field of vision, can detect threats in time, and take off and escape early.

Swallows, like some other birds, stand on power lines, and through their own diversion, there will be no electric shock, which is relatively safe. In ancient times, swallows would also choose to stand in some open places, suitable places for their own take-off, but now only wires are replaced.

Swallows do not land on trees, this is because the bird's feet have insulating properties and are not afraid of electrical conduction. In addition, the power lines are open, which is more conducive to stopping and observing whether the surrounding environment is safe.

Because this is the habit of swallows, if they land on the power line, they have a wider field of vision, which helps them to observe some of the surrounding environment, etc., and can protect themselves.

Under normal circumstances, swallows also land on trees, but the frequency of landing on telephone poles is relatively high, because the claws of swallows are thin and short, and they cannot be caught when they fall on trees.

The swallows landed on the wires like notes jumping on the staff.

First of all, when I got such a topic, my first reaction was that the title was a figurative sentence, and to find the ontology and figurative words, we needed to think of the metaphorical body, so it should be a metaphor for swallows as musical notes.

A couple of pairs of swallows got tired of flying and landed on the wires to rest. Against the backdrop of the blue sky, the few thin lines connected between the telephone poles are like staves. The stopped swallows became musical notes, composing a hymn to spring.

Here's an example of fill-in-the-blank:

The swallow landed on a telephone pole like a string of beating staves.

The swallow landed on a telephone pole like a leisurely guard.

The swallows landed on the wires like notes on a stave.

A few swallows stop on the wires like notes on a string of staves.

The gesture of the swallows resting on the wires is very harmonious and elegant, as if they were arranged in a rhythmic line, like a continuous note on a string of staff. This form not only shows the beauty and flexibility of the swallow well, but also reminds people of the beautiful melody in **. In addition, swallows perched on power lines are a very common scene of trembling and are therefore a familiar image.

The image of the swallow staying on the wire is not only a beautiful landscape, but also one of the cultural symbols of the Chinese nation. In traditional Chinese culture, the swallow is regarded as a symbol of good luck, representing family reunion and happiness. Therefore, the swallow stays on the wire or thick with a profound meaning, so that people not only feel the beauty of nature, but also experience the human emotion.

The swallow stands on the high-voltage line, forming a closed loop between its feet and the high-voltage line.

Electric shock generally refers to the flow of a certain electric current in the human or animal body, thereby causing certain damage to the organism, as long as there is no current flowing in the body, it will not form an electric shock. There are two conditions for the generation of electric current, one is a closed loop, and the other is a potential difference (which can be compared to the flow of water from a high place to a low place), and the two conditions are indispensable.

The swallow stands on the high-voltage line, and a closed loop is formed between the feet and the high-voltage line, but the distance between the feet is too small, and the potential on the feet can basically be regarded as equal, and there is no potential difference, so there will be no current flowing through the swallow's body, and the electric shock will naturally not be formed.

Precautions for electrocution of birds:

Birds can stand on the high-voltage line is not that they are not afraid of electric shock, but there is no condition for the formation of electric shock, under certain conditions, they will also be electrified, for example, the birds on the two lines will be electrocuted when they fight, but the probability of this phenomenon is very small.

The resistance of high-voltage wires is very small, while the resistance of humans or animals (including swallows) is much larger. In addition, the distance between the two feet of the swallow is small, and the resistance of the wire between the two feet on which it stands is even smaller, and the resistance ratio of the swallow's body can almost be ignored.

In some villages, towns and towns near residential areas, there are often a large number of swallows gathering wires. Nowadays, it is rare to see swallows gathering on the wires, which are not far away, and the number of swallows in the country today is conservatively estimated to be less than half of what it was twenty years ago. The most important factor is the nationwide urbanization movement.

So, why is it that only swallows (house swallows and golden-rumped swiftlets) have such a phenomenon of swarming wires?

In summer, when the temperature is high, they don't need to stay inside the nest to keep warm, and the outdoors is more breathable and ventilated than the indoors. This phenomenon mostly occurs in summer and autumn, but not in early spring, and has migrated and flown away in winter.

It is safer to rest in groups, and there are natural enemies who are close to each other to warn each other. They especially prefer electrical wires that are close to the living environment. This phenomenon does not occur in the field far from the inhabited position of the electric brother source line, because for the swallow, humans are the most reliable protectors.

Why wires and not trees? Swallows are sky people, except for resting at night, the rest of the time is in the sky, and they naturally prefer places with a good view. Unlike most arboreal and terrestrial (such as sparrow) birds, most of the time they land on trees and ground.

The swallows are extremely skilled in flying and extremely fast. Although it is easy to expose yourself by landing on the wire, as long as you can detect it early, there is basically no pressure to escape with flying skills.

According to the description of the problem, it can be seen that the ecology around the township where the subject is located must be very good, and there should be a large area of farmland. This scene is now rare to see envy, as a symbol of agricultural civilization, the folk bird, to be able to witness should feel happy!

Because both of the bird's feet are standing on the same wire, the voltage of his feet will be relatively equal. For example, if the swallow stands at 10,000 volts of high voltage, the bird's left foot is 10,000 volts, and its right foot is also 10,000 volts, so 10,000 V 10,000 V = 0 V The voltage is 0 volts, and the current is of course 0 amps, which is why the bird will not be electrocuted, because he has no potential difference at all, and of course there will be no current.

Why are so many swallows congregating on high-voltage power lines? The local agriculture and forestry authorities believe that the emergence of this natural wonder may be related to the following four aspects. First, just after the swallow breeding season, a large number of baby swallows come out of the nest one after another, and prepare for the migration in the near future by congregating.

In the past, before the migration, swallows would gather to collect; Second, a large number of swallows left Jiangnan and migrated to Hainan Island, passing through the local area, using the local area as a temporary gathering point. Every year in July and August, a large number of swallows leave Jiangnan and fly to Hainan Island for winter; Third, the local weather has continued to experience high temperatures in recent days, resulting in a large number of swallows gathering on outdoor power poles with relatively low temperatures at night; Fourth, the local natural ecological environment is relatively good, which attracts a large number of swallows to gather here.

The person concerned explained that there are many reasons for the gathering of Yan Youzi, but it has nothing to do with natural disasters. The people concerned also reminded the masses that the swallow is our human friend, and it is also a migratory bird, and its large gathering is only a temporary phenomenon, and the public should take good care of it, and do not blindly drive it away, so as not to hurt the swallow.