Ducks overhead at Boundary Bay . . .
|Flap, flap, flappity flap|
Ed Yong posted an article in NatGeo last week, reporting on studies of birds that fly in V formation. Not only is the location of each bird (specifically, in this post, bald ibises and pelicans) carefully controlled, but so is the precise timing of each flap of a bird's wing.
Ducks do it, too. But around home, they scatter across the sky helter-skelter, each flapping away merrily to his own tune.