One of the characteristics of spotted geese in flight is that they often fly in a certain formation, and the birds behind usually fly behind the side of the previous bird
During the flight, the leading geese will change positions with their rear companions from time to time, otherwise they will easily be exhausted.
they have a common human formation. Some researchers believe that this formation can reduce air resistance and flight energy consumption, but opponents believe that if it is to reduce resistance, birds should choose a straight line formation, because one flight after another can minimize the air resistance that followers need to overcome.