Flying in the shape of a “v” allows geese to have an equal field of vision while conserving energy, using wingtip vortices to decrease any drag in flight. The bird in the front is working the hardest, but when the leader grows weary it rotates to a position farther back and allows another feathered pilot to take its place.
Much like cycling teams. (except for the feather part) … (usually)
Obligatory joke:
Q: Do you know why the “V” is usually longer on one side than the other?
A: There are more geese on that side.