This morning we watched as a large flock of geese flew past our forty foot silo. Their formation was perfect. My husband commented, "Do you know why they fly in that formation?" I didn't have the answer.
Paul explained: "A bird migrating with others in a V formation is the master of the well-timed flap, able to match the up-and-down path traced by the wing tip of the bird in front of it. When they flap their wings, the vortices spinning off their rising and falling wing tips swoop up and down. For a bird to catch the benefit of another's wing trail, flap timing has to be superb."
Looking at their example I was thinking - it's kind of like humans when we "lift" each other up. Life is a whole lot better when someone has your wing...