Some migratory birds migrate in winter and have to fly tens of thousands of kilometers across the se

For the Northern Hemisphere, most of the migration time of summer migratory birds is concentrated in late autumn and winter, and the migration behavior of birds is to survive the harsh winter, fly to warmer places, and wait until the next spring, when the temperature rises, and then return to the original place. Migration can make migratory birds have more abundant food**, and can also have a better environment for the fertility of offspring, which can avoid the death of birds due to climate problems, which is conducive to the reproduction of migratory birds.

Of course, the migration routes and ranges of different species of migratory birds, as well as their destinations, vary from region to region, with some requiring only short flights, while others may require long journeys. According to the survey, the Arctic tern, the longest migratory bird that needs to be migrated, needs to fly from the North Pole over the equator to the South Pole for the winter.

First of all, before the flight, they will also be fully prepared, will carry out food storage, in the body, those stored food will be converted into fat accumulation, some as fat to prevent hunger or lack of physical strength during the flight, and some will be converted into water as a supplement. Some birds may even weigh about twice as much as their usual weight during winter migrations. But to experience a long flight, these reserves are clearly not enough.

Especially when flying over a lake or sea, it is not as easy to forage for food as above the water as it is over land.

However, scientific surveys have shown that the wintering migratory birds, especially the long-distance flight migratory birds, are mostly larger birds, but the height of their flight is not high, about 500 meters, because it is too high-altitude flight, the resistance is larger, and the physical strength consumed is more, which is not conducive to long-distance flight, but if the flight altitude is too low, it is easy to become the bag of those behemoths in the sea.

However, the flight on the sea, for migratory birds, is also a time to improve the diet, because the sea temperature in winter is not particularly low, there will be a large number of plankton on the sea surface, containing extremely rich nutrients, this is a good time for migratory birds to store organic matter, for migratory birds, it can be described as a delicacy, and at the same time, the substances in the sea water can also be stored for a long time.

Although long-distance flights are full of dangers on the sea surface, and there is no place to rest, the energy replenished is not enjoyed on land, and some small islands on the sea, and even the backs of some large fish will become a short resting place for birds, so the process of flying over the sea is also quite interesting.

Usually they eat some fish, but they also drink some seawater, so they can keep eating.

First of all, they will prepare a stock of food before they hit the road, and that food will be stored as fat. Then wait until the flight to the sea. There will be a lot of plankton on the surface of the sea, and this is the time for migratory birds to eat.

So when on the road, it is basically to eat some insects or go to the sea to catch some fish, through this way to survive, and then slowly move to the place it wants to go, it takes a process.

Generally, you will eat good food in advance to store a certain amount of fat in this way.

Summary. Bird (scientific name: bird), a bird of the phylum Chordates of the kingdom Animalia.

There are many varieties of them and they are found all over the world. The body of the bird is streamlined (spindle or fusiform), the body surface is covered with feathers, and the forelimbs generally become wings (some species have vestigial wings). The rectum is short and has a well-developed digestive system, which helps to lose weight and facilitates flying.

The heart has two atria and two ventricles, and the number of beats is rapid. In addition to the lungs, the respiratory organs also have multiple air sacs to assist breathing, so that the bird has oxygen through the lungs during both inhalation and exhalation, that is, double breathing.

A large number of migratory birds visit the eastern coastal areas of our country every year, and the migratory route does not pass through our country.

Hello There are a large number of migratory birds visiting the eastern coastal areas of our country every year, and the migratory routes do not pass through our country: white storks.

Bird (name of Potato Scale: bird), a bird of the phylum Chordates of the animal kingdom. There are many varieties of them and they are found all over the world.

The body of the bird is simple and linear (spindle or fusiform), the body surface is covered with feathers, and the forelimbs generally become wings (some species have vestigial wings). The rectum is short, the digestive system is well developed, and there are barriers to help lose weight and facilitate flying. The heart has two atria and two ventricles, and the number of beats is rapid.

In addition to the lungs, the respiratory organs also have multiple air sacs to assist breathing, so that the bird has oxygen through the lungs during both inhalation and exhalation, that is, double breathing.

Mistake. What are the options on your end.

The stork did not pass through our country, it is right, dear.

Mistake. Golden Spotted Plover.

Nor did it pass through our country.

The drifting birds did not pass by either.

Migratory bird migration is a survival instinct response of birds following their natural environment. The Arctic Tern is one of the world's most migratory birds, leaving its northern habitat in late summer and flying 16,000 kilometers to Antarctica.

Migration is a great benefit to the birds, not only to keep the birds from worrying about food, but also to make the birds comfortable for a long time, and in the south there is less threat to birds, and the survival rate of young birds is higher.

It is generally believed that this is an instinct of birds, which is not only genetic and physiological factors, but also the result of long-term adaptation to external living conditions, and has a close relationship with changes in climate, food and other living conditions.