A question about bird migration, what are the reasons for bird migration

The topic is complex.

A possibility. Because migratory bird migration is inherited from generation to generation, some birds do not change their habits from generation to generation due to climate warming;

b Possibly. As temperatures rise, some climate-sensitive birds may also fly to their warmer summer habitats in advance, which is advantageous for occupying nesting areas as early as possible;

c is also possible. Migratory birds fly from Australia to East Asia in the first half of the year and from East Asia back to Australia in the second half of the year, and the birds chasing marine fish will delay their flight to East Asia (because most of the marine fish they eat prefer cold water);

d is also possible. Because of the trend of global warming, the temperature in the north and south is generally rising, and some migratory birds do not have to travel long distances to avoid the adverse environmental climate, so the migration distance will be shortened.

From a scientific point of view, there are many types of migratory birds with different living habits, so the standard answer is not unique.

But on the whole, it is most appropriate to choose B, and the meaning of the title is that East Asia enters spring early, and Australian birds fly to East Asia in advance.

You can see that global warming will cause Australia to reach earlier temperatures for bird migration, which will lead to early migration of birds to East Asia, which is lower latitude and cooler in the northern hemisphere.

The students in my class are also a bunch of candidates C, and the students who choose B are basically guessing. The teacher is also difficult to explain, but if the bird is to nest in the warm areas of the Northern Hemisphere in advance, the student will immediately say, "Teacher, how do birds know that the Northern Hemisphere is already warming at this time?"

How to explain??

An addition to the *Huss goose yellow* answer.

The adaptive behaviors of endothermic animals to temperature mainly include: (1) avoiding unfavorable temperatures and choosing the right time for temperature; (2) Choose an activity time with a suitable temperature; (3) animal migration and external temperature; (4) Establish a shelter suitable for the microclimate; (5) Cluster behavior.

1.Birds that migrate with the seasons are called migratory birds.

2.Migratory birds are birds that migrate periodically with different seasons. Many birds migrate seasonally along latitudes, breeding in temperate regions at higher latitudes in the summer and wintering in the lower tropics.

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. These birds, which migrate north and south with the changing seasons, are called migratory birds.

3.Birds that migrate with the seasons are called migratory birds. Migratory birds travel from the south to the north, and when they pass through a certain place, they are called traveling birds.

For example, swallows travel from Guangdong to Hebei. When passing through Anhui or Huguang, it is called a traveling bird. For the division of birds, different properties can be divided into different species.

Migratory birds are called migratory birds.

4.Migratory birds represent the change of seasons and migration for survival and livelihood.

Migration: The phenomenon of birds moving back and forth between breeding and wintering areas in a regular and regular manner in spring and autumn each year. It is a survival instinct response of birds to follow their natural environment.

Reasons for migratory bird migration:

1. The migration of birds is an instinct. It is an adaptive behavior of birds to the periodic changes of environmental factors. Seasonal changes in climate are the main reasons for migratory birds.

Due to climate change, food shortages often occur during the cold winters in the north and the dry seasons in the tropics, forcing some individuals of the bird population to migrate to other areas where food is abundant. This behavior is eventually fixed by the forces of nature's selection and becomes an instinct of birds.

2. Migration brings many benefits to birds. The main manifestations are: so that birds always live in the most suitable climate, and have a rich variety of food**, which is conducive to maintaining their strong metabolism; Migration also creates the most suitable conditions for raising offspring, which requires a lot of food; In the north, the largest number of eggs can be hatched, the season is long, there are abundant insects, and the parent bird has the opportunity to collect food adequately; In the north, there are fewer predators, and the appearance of this annual vulnerability does not promote the formation of predator populations; Migration can greatly expand the activity space, which is conducive to reproduction and competition for occupied areas. It is conducive to automatic balancing, which can make the bird close to avoid climate disparity; Migration is also evolutionarily important because it provides opportunities for bird populations to spread to new ranges and for contact and mating between different individuals.

Causes of Bird Migration:

This is a kind of DU instinct of bai birds, and this instinct has not only genetic and biological causes

It is also the result of long-term adaptation to external living conditions.

Expansion of knowledge: It is closely related to changes in living conditions such as climate and food. 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.

The quality of the weather, the direction of the wind, the size of the wind, etc., have a greater impact on the migration of birds, and the more suitable is the sunny weather, and there is a tailwind with a wind force of 3-5. However, some of the birds that migrate in the spring are sometimes in a hurry to rush to their breeding grounds because of the approaching breeding season, so they continue to migrate despite the difficulties even in very unfavorable climatic conditions. What's even more amazing is that the birds can fly very well during migration, sometimes to the left, sometimes to the left, sometimes to rotate, sometimes like thousands of horses jumping in the air, which is spectacular.

Wild geese, red-crowned cranes, white cranes, black-necked cranes, white swans, swifts, terns, white-fronted terns, bearded gulls, cuckoos, cormorants, etc.

It's so stuck, you don't have money to buy socks, you buy stinky socks, and you will be smoked for the rest of your life.

Migratory birds can be divided into two types: summer migratory birds and winter migratory birds.

The former refers to flying to a certain area in spring and summer to nest and settle down, give birth to children, when the young birds grow up, it is late autumn, they fly to the warmer areas in the south to winter, and fly to this area to breed in the spring of the following year, for this area, this kind of bird is called summer migratory birds. Such as Jiayan, etc., spread throughout all provinces and cities in China in summer, and migrate to southern Yunnan, Hainan Island, Xisha Islands and Taiwan in winter; For example, cuckoos and orioles are also summer migratory birds.

The latter refers to wintering in a certain area in winter, flying to the north to breed in the spring of the following year, and when the young birds grow up, it is late autumn, and then fly to the original area to winter, for this area, this kind of bird is called winter migratory birds. For example, wild geese, swans, wild ducks, etc. are winter migratory birds in the middle and lower reaches of the Yangtze River in China. Most migratory birds have the habit of migrating from north to south, and the farthest can cross the ocean, such as the peregrine falcon, which can reach Australia directly from Siberia via China.

In addition, there are very few migratory birds that can fly from west to east or vice versa.

Geese generally have migratory habits.

Examples of migratory birds: wild geese, swans, mallards, cuckoos, orioles, black-tailed gulls, wild geese, bean geese, mallards, shelducks, spot-billed ducks, and so on.

Movies about migratory birds, you can't miss "Migratory Birds", also known as "Dreams and Birds Flying", by the famous French director Jacques Anderson

You mean "migratory birds", right?

Cuckoos, orioles, wild geese, swans, mallards, chaffinches, yellow finch, willow warblers, white-naped cranes, bald eagles, herons, sparrowhawks, waxbills, great, and more.

Hope it helps, Nam no Jizo Bodhisattva!

Mallards, geese, house swallows, cuckoos, swans, arctic terns.

Swallows, geese, swans, Chinese herons, and sparrows.