Goose is always "captain" by experienced old geese, flying in front of the team. Because the leading geese flap their wings to drive the airflow, a low-pressure area will be formed behind them. Followed by geese can use this low pressure area to reduce the air resistance during flight, and it will be easy to fly. You can also gently lift the geese, so that the geese who have traveled long distances will not fall behind, which is conducive to the continuous flight ability of the whole group. They are arranged in the shape of "people" or "one", which is also a manifestation of the herd instinct, because it is conducive to defending against the enemy's harm. If the lone goose flies south, it is in danger of being eaten by the enemy. During the long journey, the geese were well organized. When they are flying, they keep making "honk, honk" calls, which are signals to take care of each other, call, take off and stop.