The swallow's nest was clean before, but now it's full of feces. Why don't swallows like to be clean?
There is a saying in the Book of Poetry: "The Mysterious Bird of Heaven's Destiny descended into Shang, and lived in the vast land." The Mysterious Bird here is actually the swallow that we know well in our daily life. The swallow has always been regarded as an auspicious bird. If there are swallows building their nests, it means that the family is lucky and auspicious. But in recent years, swallows have become more and more despised, why is this?
People found that swallows seem to be different from before. In the past, swallows were very clean. Although they built nests in people's homes, they had no impact on people's lives. Now swallows seem to like to urinate everywhere, and the underside of the eaves is white and gray. Swallow excrement, and even clothes hanging outside were not spared, which caused a headache for the homeowner. Some people even smashed the bird's nest directly to prevent the swallow from building the nest. It can be said that the image of the swallow is getting worse and worse. Then some people must be curious, why swallows are not as clean as they used to be? There doesn't seem to be so much excrement under the previous swallow's nest!
In fact, there are many reasons for this. First of all, we need to know the fact that swallows have always liked shit like this .
As a type of bird, swallows do not have the curved intestines of mammals. The rectums of birds are generally very short, which means that there is no feces in their bodies, so birds generally pull after eating. . The digestive system of birds is also very developed. They usually eat some small gravel to help digestion when they eat. At the same time, their gastric mucosa has a strong ability to secrete gastric acid, so for most birds, they eat fast and digest well. Fast and fast. In this way, swallows may not love cleanliness so much in the first place, and it is their characteristic to be small and large. Of course, if you want to go deeper, you can still find some other reasons.
The bottom of the bird's nest is not as clean as before, mainly for the following reasons.
The first is that the species of swallows has changed. Swallow is actually a general term, belonging to the genus Passerine. There are 74 species in the world. There are four common species in China. The living habits of each swallow are slightly different. In the past, houses in rural China had small windows above the gates, and swallows could enter the house through the small windows. Generally, swallow nests were built in the house. The swallows that build their nests in the house are not the same species as the current swallows that build their nests under the eaves. The scientific name of the previous swallows was called golden-waisted swallows . The body length was generally 16 to 20cm. blue feathers. This kind of swallow likes to build the nest in the house, and the swallow's nest is very delicate, and the elderly also call it " Qiaoyan ".
With the development of society, the shape of houses in many villages has changed, and brick and tile houses have become popular, which has led to the golden-rumped swallow having to move out of people's homes, and the original ecological niche is occupied by another type of swallow. The whole body is black and the body is large. It likes to build nests under the eaves, and is generally called the barn swallow . The living habits of the barn swallow are less hygienic than that of the golden-waisted swallow. Unlike the golden-waisted swallow, which will carry the excrement far away, the barn swallow's defecation habit is to stand directly at the mouth of the swallow's nest and pull down.
The second is that the structure of the nest is different. Older friends may find that the nests built by swallows today are different from those in the past. The nests of swallows in the past were very round, like a gourd scoop attached to the corner of the wall. The gourd-shaped swallow's nest has a very small opening and is generally oriented upwards. Only one swallow can enter and exit. Such a swallow's nest determines that the swallow's excretion can only be arranged in the nest, and then the adult swallows take it out of the nest.
The shape of the current swallow's nest is different. Its large opening is somewhat similar to the nest of turtledoves and pigeons. In such a swallow's nest, if the swallow wants to defecate, it only needs to stick its tail out of the nest and discharge directly to the nest below the nest. The corridor is very convenient. The shape of the swallow's nest is different, which determines the different way of life of the swallow. Most of the barn swallows now have this kind of semi-open nest, so it is not surprising that there is feces underneath.
The last reason is very irritating. Many feces under the swallow's nest are not swallows at all. The "black hand" behind the scenes has another bird, that is, the sparrow, one of the four evils that we are familiar with .
Because swallows are migratory birds, they build nests under the eaves to lay eggs and hatch young swallows. Generally, two broods are produced. The young birds can grow to the size of adult birds in a month. By October, most swallows will migrate to the south for winter. At this time, swallow nests When it is empty, the sparrows will fly in and come to "the bird occupies the swallow's nest". Sparrows can be hygienic or unsanitary. Anyway, they are not their own nests. It is irrelevant to defecate anywhere. By the way, they will sneak into the granary of the owner's house to steal food.
We will find that after the Mid-Autumn Festival, the color of the feces under the swallow's nest will be different. This is actually the feces of the sparrows. Although the swallows are also unhygienic, one yard is one yard, and the feces after October are not pulled by them. , the culprit is the sparrow.
From the above analysis, we can find the reasons why the swallows are not as clean as before, but these reasons are only analyzed from an objective point of view, and we should also pay attention to what changes have taken place in human society itself.
With the development of China's economy, people's lives have become more and more prosperous. The original adobe houses have been replaced with buildings, and the original mud corridors have also been covered with marble tiles. The house is no longer full of dust like before. , everywhere is glossy, a little stain will be particularly eye-catching. At this time, the feces under the swallow's nest are very abrupt. If they were placed in the past, people would not have noticed this at all. In the past, some rural households would raise some chickens and ducks. Compared with the feces of chickens and ducks In other words, the swallow's excrement is really "insignificant", who will blame the little swallow?
In the final analysis, people's mentality has changed, and they can no longer tolerate a little filth. In fact, what swallows can bring to people is not just auspicious. Swallows are beneficial birds. For farmers, they are simply good deworming experts. All Swallows like to prey on insects. Swallows have a particularly large amount of prey on pests when they are raising young birds. This period is also the vigorous stage of rural crop growth .
Friends who have lived in the countryside since childhood may have a feeling that swallows are becoming fewer and fewer now. It is hard to see the swallows that once dragged their tails and fluttered in groups in the sky. Only. Maybe the swallow is really spiritual, and I feel people's disgust for it!
"In the old days, Wang Xietang flew into the homes of ordinary people." In any case, swallows have accompanied us from generation to generation. We can't destroy the swallow's nest because of the problem of swallow feces. Both the golden-waisted swallow and the barn swallow should be protected. .