Birds fly around in flocks. They like to be together and it is where the saying, "Birds of a feather flock together," comes from. However, an analysis has found that for the pigeon, flying as a flock costs them more energy than to fly alone. Birds like pelicans and swans fly in V-formations. Research has shown that this gives the birds a benefit in aerodynamics. They don't need to flap their wings as much and their heart rates drop. This has been extended to flying aircraft in V-formations to reduce fuel consumption.
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