Abe V Rotor
Those who watched the movie Fly Away Home know why wild geese fly in V formation. Using a motorized glider as the lead, the home grown flock followed it all the way along the migratory route. The working principle of the V formation may be illustrated by the body shape of a fighter jet, particularly the stealth. The nose of the plane breaks the air barrier. Likewise the lead bird bears the same brunt, relieving much pressure on the members of the flock.
Now and then the leader falls back to rest, with the bird next in position taking over the lead. This relay takes place many times during the non-stop flight covering hundreds of miles. Those that cannot endure the long journey break away and make it to land where they may recover and later join the flight of succeeding flocks. Many don't make it, while others adapt to the place as their new home. Our native duck (itik) was introduced this way, which interbreed with local breeds. ~
Living with Folk Wisdom, AVR; Wikipedia
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