One characteristic of bar-headed geese in flight is that they often fly in a certain formation, usually the bird side rear flies behind the previous bird
Bar-headed geese have the need to determine the direction when flying, so they will not always line up in a people shape to fly
there is a common people formation. Some studies The author believes that this formation can reduce air resistance and reduce flight energy consumption. However, opponents believe that if it is to reduce resistance, the birds should choose a straight formation, because one flight closely following one can minimize following. The air resistance that the person needs to overcome.