Winter is coming, why do geese fly south?

Wild geese flying south in winter are a form of bird migration. Bird migration's reasons are very complicated. It is generally believed that this is an instinct of birds. This instinct is not only the result of genetic and physiological factors, but also the result of long-term adaptation to external living conditions, which is closely related to changes in living conditions such as climate and food. Migratory birds are very sensitive to climate change. As soon as the climate changed, they began to migrate to escape the cold in winter in the north. Climate change also directly affects the food conditions of birds. For example, after autumn, most plants in northern China withered their leaves, and insect activities decreased. After laying eggs, they successively burrowed into the ground to sting or die, and the number dropped sharply. Lack of food makes it impossible for birds to sustain life. Only by migrating to the food-rich south can they survive the winter well. Birds also have another instinct, the so-called homing instinct, which also plays a key role in the migration of geese from breeding grounds to wintering areas. This is the main reason why you let the geese fly south. Answer over! Hehe, the answer is: walking is too slow! !