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The birds in the middle of the formation get the most benefit. The lead bird breaks up the wall of air that the flocks flies into and experiences the most air drag or air resistance. The resulting swirling air or eddies caused by the lead bird's movements creates a lift or upwash for the birds behind it and so forth. The tubes of circulating air called wingtip vortices are generated as the wings generate lift. One wingtip vortex trails behind the tip of each wing. Each bird positions itself in a staggered position to the bird in front of it to get the extra lift and reduced air resistance or drag. A bird flying in formation therefore expends less energy than when it is flying solo. Another reason for flying in the V formation is that each bird can observe the position and flight direction of the other birds in the flock to avoid collisions, as well as, to keep the flock together. It is more aerodynamic and more energy efficient than flying solo.
It allows for better visual communication. Illustration of wingtip vortices - A picture says a thousand words. This illustration shows how wingtip vortices are generated at the tip of the bird's wings. Air moves from the area of high pressure (under the wing) to the area of low pressure (top of the wing) at the tip of the wing. As the wings move through the air, this curling action causes spirals or vortices at the tips of the wings. The rising air or updraft of the vortices shedding off the bird in front will lift up the bird trailing behind it. Migratory birds take advantage of each other's wingtip vortices by flying in a V formation so all but the leader are flying in the upwash from the wing of the bird ahead. A little upwash makes it a little easier for the bird to support its own weight. It also lowers the heart beats, increases the flying range, and conserves up to 50-70% more energy.
In most bird species, there are 10 primary feathers along the outer edge of each wing. The primaries propel the bird through the air. When a Canada goose flaps its wings during flight, several things happen. During the downstroke (power stroke), a wing moves downward and forward producing forward thrust. During the upstroke (recovery stroke), the tips of the primaries separate and these 'slots' allow passage of air through them which reduces friction or drag as the wing comes up. When a goose is hurt or shot and falls out of formation, two of the geese will leave the flock and follow the injured geese, stay with it, nurture it until it recovers. Or in the case that the injured bird dies, the two geese will start a new formation and catch up with the flock. Snow Geese breed in the Arctic Tundra and winter in farmlands, lakes and coastal areas in the American south, southwest and east coast.