Geese migrate
Geese are excellent air travelers. Every autumn and winter, they fly to the south of China from their native Siberia in large groups. The following spring, they return to Siberia after a long journey to lay eggs and breed. Wild geese fly very fast, can fly 68 to 90 kilometers per hour, thousands of kilometers long journey to fly for one or two months.
On the long journey, the geese are very tightly organized, they often form a herringbone or a glyph, they fly, but also constantly give out "quack, quack". This kind of wild goose call plays the role of mutual care, call, take off and stop signal.
