When will these geese fly to the north? When will we arrive in the south?

The geese fly back to the north to breed after the vernal equinox (around March 20 in Gregorian calendar), and fly to the south for the winter after the autumnal equinox (September 22-24 in Gregorian calendar).

Extended data:

Living habits of geese:

Gus is an excellent air traveler. Every autumn and winter, they come in droves from their hometown of Siberia.

Fly to the south of our country for the winter. The following spring, after a long journey, they returned to Siberia to lay eggs and breed. The flying speed of geese is very fast, which can fly 68 ~ 90 kilometers per hour, and the long distance of thousands of kilometers is only one or two months.

During the long journey, these geese were well organized. They are usually arranged in herringbone or zigzag. When they fly, they keep making "honk, honk" calls. This cry of geese plays a signal role of caring for each other, calling, taking off and stopping.

The geese keep a strict and neat formation, that is, they are arranged in a "human" shape or a "one" shape. 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.

The same principle also exists in track and field sports. In the middle and long distance race, some experienced athletes will not run first, but run closely behind one, because the air resistance to him will be smaller than the first. It's also easier to run.

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.

References:

Baidu Encyclopedia-(Goose)