What are migratory birds doing when they come back to the north in spring, isn t the temperature in

Causes of Bird MigrationOne theory holds that bird migration in northern northern hemisphere originated during the Ice Age. At that time, the birds in this area were forced to migrate south due to the advance of the glacier, but their attachment to their homeland did not change, and when the snow melted the following summer, they returned to their birthplaces to nest and breed.

Another theory is that all birds originated in the tropics, and some of them moved north in search of better breeding grounds, and after the breeding season, they were forced to migrate south because the winter cold was unbearable, and the habit was repeated the following year.

There is also a theory that most birds have roaming habits, and only a few birds live in one place, they must endure all the harsh local climate, and some species are eliminated by the environment, and only those birds with roaming habits are easy to survive. This hobby of birds, due to the evolving selection of the environment, has gradually formed different migratory routes.

What exactly is the reason for this is yet to be studied, and the jury is still inconclusive.

Spring.

Migratory birds migrate periodically with the seasons, breeding in temperate regions at higher latitudes in the summer and wintering in the lower tropical regions. In late summer and early autumn, these birds migrate south from their breeding grounds to their winter grounds, and from their winter grounds north to their breeding grounds in spring.

Migratory Bird Introduction:

The Oriental White Stork is a large wading bird and is a national first-class protected animal, with about 2,500 of them in the world. It begins to breed in March every year, and the breeding grounds are mainly in the central and northern parts of Northeast China, and wintering in the lower reaches and south of the Yangtze River.

The white crane is a large wading bird, a national first-class protected animal, with about 3,000 animals in the world. Siberian cranes breed in northeastern Siberia and migrate in large flocks in autumn and spring, wintering in the middle and lower reaches of the Yangtze River.

The relict gull is a national first-class protected wild animal and is listed as an endangered species. The Ordos population is the largest in nature, with a maximum population of 16,000 individuals. The relict gulls breed from early May to early July and migrate south in October.

From Ordos to Bohai Bay, it is the only relatively fixed flyway route known so far.

Migratory birds fly south in autumn and north in spring. In the summer to the north, in the winter to the south to overwinter.

The ancients used three words to describe it - Hou Yanbei. This means that at this time, the swan geese that fly south in winter will return to their homeland in the north. This Pechnelop is the equivalent of the first Penelope of the White Dew Season, "The Swan is Coming".

In autumn, to escape the cold winter, swans run from north to south. Spring is coming, go home. Wild goose migration is a behavior that adapts to the cyclical changes of environmental factors.

Due to climate change, food shortages in the cold winters of the north and dry tropical seasons force geese to migrate to the south in the fall, where food is plentiful and the climate is mild.

<> geese, also known as geese, swans, and large migratory birds, are national second-class protected animals. Wild geese are enthusiastic and can encourage their companions by calling to encourage them. Duck family is a general term for various duck families.

Common geese in China are swans, gray geese, bean geese, and white-headed geese. A goose is made up of six geese, or rathers in multiples of six, while a flock is a collection of a family or flock.

North Point has a suitable temperature in spring, summer, autumn, winter, spring, summer and autumn all year round, especially in winter, the climate is very cold, so geese can not adapt to the cold climate, in autumn, geese will draw a straight line in the sky in flocks, arranged into a zigzag and herringbone shape moment by moment, very teamwork, go to the south for the winter, after the winter, the geese will return to the south in the autumn to prepare for the winter. Temperatures are high in the south and low in the north. Due to the rotation of the earth, there are four seasons in a year.

The temperature difference between spring, summer, autumn and winter is different. The cold weather in early spring is getting warmer and warmer, everything is revived, all kinds of birds go out to peck, wild geese fly back from the south, and spring blooms. Summer is hot, autumn is cold, the sky is high and slow, and the wild goose flies south to tell us to prepare for winter.

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Because in the autumn, the northern Tianyuan has gradually turned cold, and they are going to the south of the hail, because the south is warm. By the time spring came, it was cold again in the south of Hail, so they had to go back to the north.

Because the weather has become cold in autumn, migratory birds will not return to the south if they do not get enough food, and the temperature in the south is relatively warm.

Because migratory birds are not frost-tolerant and may freeze to death at any time, they need to return to the south in autumn, but they are not particularly afraid of heat, so they need to return to the north in the spring if they are noisy.

They need to fly to a place suitable for their own survival, so as to ensure their own need to reproduce and avoid causing a population**.

The big swallow spends the winter in the south and the sparrow sparrow spends the winter in the north.

Ostriches are in the north and swallows are in the south.

Hello, although it is very cold in the south in winter, the food in the south is abundant, which is also the main reason why migratory birds fly south in winter.

1. Because in the winter in the north, the food that can be provided to migratory birds is greatly reduced, and the water surface in the north will basically freeze in winter, which basically loses the food for birds that feed on animals in the water, and a large number of insects will also enter hibernation.

2, caught in the situation of food shortage, but do not think that the southward migration of migratory birds is from the north of our country, fly to the south of our country such a short distance, in fact, most of the migratory birds of the southward distance, far more than the distance of the dry country, which may fly to a certain place in the southern hemisphere, then you may ask, since these migratory birds have to fly to the south every year, why not simply live in the south, but in fact, the south is often humid climate.

It is not suitable for some birds, and if all birds survive in the south, food will also face a big problem, which will threaten the survival of birds. So don't underestimate the southward migration of migratory birds. Thank you.

A migratory bird is a bird that changes its habitat with seasonal variations. Such as swallows, cuckoos, geese, cranes, warblers and so on. Migratory birds generally migrate twice a year. Once in autumn and winter, it leaves its reproductive area and migrates south, because the south is warm and lively, and it is an ideal place to escape the cold.

The other is in the spring, when they move from their wintering grounds back to their original habitats. However, bird scientists have found that not all migratory birds fly south, some fly east, west, and even migrate to colder places --- north. Of course, the majority of migratory birds fly south.

For example, around the Mid-Autumn Festival every year, the wild geese living in northeast China and Inner Mongolia will gather in groups and migrate to the Yangtze River basin or the Pearl River basin for wintering. In the spring, they return to the north in droves. Suzaku is a bird that flies east from its hometown.

This bird is covered with vermilion feathers and looks very beautiful.

They mostly breed offspring in the northwest and southwest regions of our country. When autumn comes, the bird flies eastward to spend the winter in southern China. Birds that fly from east to west are mainly terns and pintail mallards.

The tern is a waterfowl that lives along the coast of our country. Whenever they migrate, they fly west along the Yangtze River.

The pintail duck takes off from Lake Onega in Europe, skims over St. Petersburg, the Gulf of Finland, Latvia in Russia, and then over the Baltic Sea, along the north coast to Great Britain, where it spends the harsh winter. The most hardy migratory bird in the world is the eider duck. Before wintering, they migrate north to the Arctic Ocean to spend the winter.

They often forage on ice floes at temperatures of minus tens of degrees Celsius or in the deep waters along the coast, and are not afraid of the cold at all.

In winter, geese fly south because geese are migratory birds, and they begin to migrate south every autumn, all because in winter, the north is covered with snow and ice, and food is sharply reduced, while the weather in the south is warmer than in the north, which is also conducive to the foraging of geese. On the way to migrate, geese generally do not act alone, they are hundreds of them flying together, one of them is the leader, and the other geese are lined up according to a word, or herringbone, following behind.

Wild geese, also known as wild geese, swans, and large migratory birds, belong to the national second-class protected animals. The wild geese are full of enthusiasm and can encourage their companions with their cries. The wild goose belongs to the class of birds, the duck family, and is the common name of various classes of the wild goose subfamily.

The common ones in China are the Hong goose, the gray goose, the bean goose, the white-fronted goose and so on. A flock of geese is a group of 6 geese, or in multiples of 6, and a flock is a group of families, or groups.

The wild geese were originally in the northern Siberian region, but in the autumn they will begin to move to the southern part of our country to spend the winter, and after the beginning of spring, they will fly back to Siberia to lay eggs.

The geese are arranged in a neat herringbone or zigzag, which is also a manifestation of the instinct of the cluster. Because this is conducive to defending against enemies. The flock of geese is always led by experienced old geese as the "captain" and flies at the front of the team.

During the flight, the wild goose leading the team is very physically exerted, so it often switches places with other geese. Young and frail birds are mostly in the middle of the procession.

This puzzle can be answered from two perspectives, namely:

Birds migrate far beyond what we think of as "south" in our everyday context.

There is no particularly unified and clear understanding of why birds migrate - don't be surprised, with the current level of human science and technology, there are still too many unanswerable questions - many researchers have put forward their own hypotheses, the most widely accepted hypothesis is this: these migratory birds originally lived in the north of the northern hemisphere (or the south of the southern hemisphere), because of the arrival of the ice age, the world generally became colder, in winter, cold air pushed from north to south (in the southern hemisphere, from south to north), Birds in the northern hemisphere are driven to flee south (northern in the southern hemisphere) and return to their original habitat in the summer, creating a migratory instinct.

In the process, it's not just the low temperatures that birds have to escape. Birds generally have thick plumage and are generally more resistant to severe cold than other species. But the difficulty of foraging due to low temperatures is unavoidable:

In winter, when the temperature drops, some plants almost stop growing in order to reduce water evaporation and reduce internal consumption, which is a fatal famine for some birds that feed on fruits and grains; Moreover, the winter temperature in the north drops below freezing, the lake and sea surface freeze, and waterfowl cannot hunt; Even more deadly, the drop in temperature has caused almost all insects to either freeze to death or hibernate, and the birds that feed on insects have lost food**. These food shortages are the main reason for the migration of birds in the northern hemisphere to the south (and northward in the southern hemisphere).

Barn swallow. House swallows feed on insects, and winter insects in the northern hemisphere either freeze to death or hibernate, and house swallows cannot get enough food and have to migrate south.

And the "south" where birds migrate is not the same thing as the "south" that our people often say. When our Chinese people talk about the south, we roughly refer to the south of the Huai River and the Qinling Mountains, or the south of the Yangtze River. But on the map of bird migration, the south looks like this:

This is the migration map of the house swallow that we are familiar with. The yellow part is the distribution area of our summer house swallows in the northern hemisphere, and the blue part is the distribution area of winter house swallows in our northern hemisphere. You read that right, don't look at the small size of the Jiayan, but the south it is going to also refers to "somewhere in the southern hemisphere", not the two lakes and two Guangzhou, Jiangsu, Zhejiang and Shanghai as we say.

For example, our swallows in East Asia, they will migrate to Southeast Asia, Australia; Swallows from Central Asia spend the winter in India, South Asia; The swallows in Europe are even more cattle, crossing the Mediterranean, crossing the Sahara Desert, and going to southern Africa for the winter; Swallows from the Americas travel south along Mexico and the Caribbean islands to spend the winter in the heart of South America. How can it be cold in the winter of our northern hemisphere, which is the summer in these regions?

Of course, there are many different types of migratory birds, and their migration destinations are also different. Some birds, such as the red-crowned crane that lives in our country, migrate south from Qiqihar, and stop only when they reach Yancheng in northern Jiangsu, because the ice age in Yancheng is not long, and.