Why Do some Birds Fly in Formation?

They don't get so tired that way. When one bird flaps its wings it makes a draught. Birds to the rear get help from this draught and don't have to fly so hard. Birds in front and rear change position now and then to help even up the work. Flying in formation makes it easier for birds to flee from enemies. When they are in nice straight lines they can turn sharply in any direction without bumping into other birds. So if they meet a and enemy, the entire flock can change direction instantly. And that is the way that they escape. Large birds such as ducks and geese normally fly in a wedge formation, while smaller ones such as starlings and thrushes usually fly in close groups. The tips of flying birds' wings create air currents, and it is believed that a bird flying behind another can rest on the rising air currents and thus not use so much energy. The V formation lets bigger birds change directions suddenly without flying into one another.