Every fall, when the cold climate in the north is no longer suitable for geese to survive, the geese fly to the warm south. Goose are excellent air travelers. Whenever the fall and winter seasons, they are from the old home around Siberia, flocks, and vastly fly to the south of our country for the winter.
The next spring, they traveled a long distance, back to Siberia to lay eggs and reproduce. The flight speed of geese is very fast, can fly 68 ~ 90 kilometers per hour, thousands of kilometers of the long journey to fly for a month or two.
Features of the geese's south flight:
The geese keep a strict and neat formation, i.e., in the shape of "human" or "one". Because they fly all day long, relying on the strength of a single goose is not enough, must help each other to fly fast and far. Have the strength of the geese in fluttering wings to fly, the wing tips fan up a wind, from the bottom to the top, will gently lift the geese, the long-distance journey of the geese will not fall out.
Generally rely on the front of the geese, is very strong, very experienced, due to the role of the head of the geese flapping wings, drive the airflow, if the row into the "human" or "a" zigzag flight, the back of the geese will be very easy to fly, will not have to rest a lot of time. Many times. In the process of the head goose flying behind it will form a low-pressure area, immediately after the geese flying can use this low-pressure area to reduce the resistance of the air. In favor of the whole group's ability to continue flying.
Reference: Baidu Encyclopedia - geese