Why do ducks geese etc fly in uneven v formation?

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If they flew in a straight line, all the ducks except the front one would be flying in the wake turbulence of the duck in front. By flying in a V, each duck has mostly undisturbed air in which to fly, plus, the disturbed air in which they DO fly is the beneficial portion of the wing tip vortex of the bird ahead, giving them some "free" lift and requiring marginally less than full power to maintain flight. Also, by flying in a V shape, they can keep an eye on the leader at the same time. For a scholarly paper on the subject, see the link bellow.