Why do birds migrate? Why do migratory birds have to go to the trouble of flying back north? Isn t i

There will always be a variety of strange landscapes in nature, and everyone usually knows the allusion of migratory birds flying south. Why do birds have to migrate? Why do migratory birds have to go to the trouble of flying back north? Isn't it bad for these migratory birds to stay in the south?

In fact, I am also very interested in this problem, everyone may find that these birds are gone in winter, because these birds have now flown to the south, because the climate in the south is warmer, and this time is more suitable for bird life. In fact, migratory birds have migratory habits, but in the spring, you may find that these birds fly back. Migratory birds choose to migrate because it is too cold in winter to be suitable for these birds.

In fact, this is also the result of a natural selection of birds, in fact, migration is a very risky behavior for birds, because in this process these birds are easy to make mistakes, and then these birds may die, but these birds in order to better survive, they will naturally choose to migrate, in fact, this itself is also a natural survival of the fittest. Because most birds are not able to adapt to such high temperature differences, and some birds themselves are very resistant to cold, these birds will fly from high latitudes to low latitudes to spend the winter, and then they will fly back again in the spring. At this time, these birds are actually there to breed, and also to get better food.

In fact, these phenomena can be observed in real life, in fact, there are birds at high latitudes, for example, most of the sparrows will stay in the winter, and the only bird that everyone can see in winter is the sparrow. Therefore, the reason why these birds go to the south to spend the winter is also to better survive, which is also a very natural phenomenon, and detailed information can be queried on **.

Birds migrate in search of a more suitable environment for survival. There are some birds that are migratory birds. In winter, they will fly south to spend the winter. And spring will return to the north.

In this way, it can drive the development of the biological chain, and then in the summer, the air in the south is more humid, so it will fly back to the north at this time, which is not good.

In this way, you can find a suitable living environment for yourself, and you can make your race survive effectively. Because the north is their home, they can reproduce here. Not good, staying in the south is not a very good option.

The reason why migratory birds come to the north in summer is because the temperature in the north is not too high in summer; Their purpose is to escape the heat, but also to better adapt to survival, to extend their use time, and to choose more food.

Migratory origins.

The origin of the migratory behavior of birds and other organisms has not been determined, and the more glacial period is closely related to the origin of bird migratory behavior. Some scholars believe that migratory behavior comes from the pressure of natural selection, because migratory behavior is the most difficult and highest mortality stage in the life cycle of birds, so birds with migratory behavior have experienced harsh natural selection in the process of migration, and bird populations with this behavior will occupy a reasonable position in the competition for survival, and this kind of principled pressure has formally created bird migration behavior.

Classification of the conduct in this paragraph.

Depending on the migratory behavior of birds, birds can be divided into different types of dwellings. Resident birds: Resident birds are those birds that do not have migratory behavior, they live in their birthplace all year round, most of them do not even leave their nesting area for life, some resident birds will carry out non-directional and short-distance migration, this migration is regular in some cases, such as crows will gather in the central area of the city in winter, and in summer will disperse to the suburbs or mountains, this regular short-distance non-directional migration is called "drifting"; There are also species such as snowcocks that migrate between high and low altitudes depending on the season, this migration is called "vertical migration", and although it is called migration, it is still a behavior of resident birds; The short-distance migration of some species is completely irregular, simply wandering with changes in food conditions, and this bird is actually a transitional type between resident and migratory birds.

Migratory birds: Migratory birds are those that migrate and travel between breeding grounds and cold shelters along a fixed route in spring and autumn each year. In different regions, according to the time of appearance of migratory birds, migratory birds can be divided into summer migratory birds, winter migratory birds, traveling birds, drifting birds, if birds, in its cold shelter it is regarded as winter migratory birds, in its breeding place (or summer resort) is summer migratory birds, in the area it passes through to and from the cold shelter and breeding place is a traveling bird. In a certain wide area, or in the summer in the mountains and forests, and in the winter in the plains, it is regarded as a drifting bird.

Lost birds: Lost birds are those birds that deviate from their own migration routes due to bad weather or other natural reasons and appear in areas that should not appear, such as the great flamingo once found in the East Dongting Lake Nature Reserve in Hunan Province, China.

The difference between migratory birds and resident birds is not absolute, the same bird species, for various reasons, may show different residence types in different regions or even in the same area, and the factors that determine the residence type of a bird species in a place are local climate, food conditions, habitats, etc. For example, the red-crowned cranes that breed in Hokkaido, Japan, were originally summer migratory birds, but due to the fact that the local people continue to feed them regularly in winter**, some of them have given up their migration instincts and become local resident birds. Another example is the passerine black curly-tailed bird, which is a resident bird in Hainan Island and Yunnan in southern China, a summer migratory bird in the Yangtze River basin and northern China, and a drifting bird in Europe.

Because some birds like to live in certain climatic conditions such as temperature and humidity, they will periodically migrate to the most suitable place.

The reasons for bird migration are complex, and it is generally believed that it is an instinct of birds, which not only has genetic and physiological factors, but also is the result of long-term adaptation to external living conditions, and has a close relationship with changes in climate, food and other living conditions. Migratory birds are sensitive to climate change, and as soon as the climate changes, they begin to migrate. In this way, it is possible to avoid the harsh cold of the northern winter and the scorching heat of the southern summer.

Changes in the climate also have a direct impact on the food conditions of the birds. For example, after autumn, most of the plants in northern China have lost their leaves, withered, and insect activities have decreased, and they have successively burrowed into the ground to sting or die after laying eggs, and the number has decreased sharply. The scarcity of food prevents small insects-feeding birds from sustening, and they have to migrate to the south, where food is plentiful, to survive the winter, and birds that hunt insects and small insectivorous birds migrate south.

For a livable ambient temperature and abundant food.