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
When the bar-headed goose is flying, the companion in front of the deviation cannot minimize the air resistance, but it can greatly reduce the physical energy required for ascent
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.