What is the reason why geese fly south?

The reasons why geese fly south are as follows:

Scientists have two views on the flying geese in the south, based on ancient geography, climate and the situation of ancient animals, combined with modern bird materials.

The first view is that the north is the hometown of birds. A long time ago, the climate in the north was warm and the seasons were like spring. Birds lived a happy life there. But about 3 million years ago, the earth suddenly became cold, and it was in the Quaternary glacial period. It was freezing in the north, and it was difficult for birds to find food, so they had to leave their hometown and fly to the warm south for the winter.

Later, when the glaciers thawed and the weather became warmer, they went back to their hometown to have children. It has been formed for a long time that every spring must fly back to the north and autumn must fly to the south.

The second view is that the south is the hometown of birds. At first, there were not many kinds and numbers of birds, and their habitats were limited. Later, a large number of breeding, the number gradually increased, the original place can not live, it is difficult to find food, so slowly expand their own residence. After the Quaternary Ice Age, there were few birds living in the north, so they flew to the north to give birth and flew back in autumn. Long-term like this, form a habit.

The reason why geese are arranged in the word "one" or "people"

These geese fly in herringbone or zigzag, because they fly all day. It is not enough to rely on the strength of a goose. They must help each other to fly fast and far. When powerful geese flap their wings, a gust of wind blows from the tip of their wings, and when they are sent from bottom to top, they are gently lifted up so that they will not fall behind after a long journey.

Generally, the geese in front are very powerful and experienced. Because the head geese flap their wings to drive the airflow, if they fly in a herringbone or zigzag way, the geese behind them will fly easily without taking many breaks. A low-pressure area will be formed behind the head geese during the flight, and the geese that follow can use this low-pressure area to reduce the air resistance during the flight. It is beneficial to the continuous flight ability of the whole group.

In addition, the neat herringbone or zigzag arrangement of geese is also a manifestation of herd instinct. Because it is conducive to defending against enemy damage. Goose is always "captain" by experienced old geese, flying in front of the team.

During the flight, the leading geese are physically exhausted, so they often exchange positions with other geese. Young birds and weak birds are mostly inserted in the middle of the team. An experienced old goose always acts as a sentry when stopping by the water to look for aquatic plants. If the lone goose flies south, it is in danger of being eaten by the enemy.