Why the flock of migrating birds mostly flies in ‘V’ formation only?

Chief advantage of ‘V’ formation is that the birds following the leader in two arms of the ‘V’ formation do not have to exert very hard to remain afloat. As the leading bird beats its wings the air is displaced upward. The upward draught of air assists immediately following birds in remaining airborne with less effort. These birds in their turn make flying easier for those that follow by creating upward draught of air and so on. Of course, the leading bird does not receive such assistance. So it would get tired sooner than the others. The birds solve this problem by taking turns to lead the flock.

When you see a ‘V’ formation of the birds overhead, note to observe the switch over of the leading position.

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