When they aren't in the water, waterfowl waddle their way through life.
Swans and most ducks are clumsy and awkward on land. Some kinds of ducks can barely walk at all, and hardly ever leave the water. Geese are a bit better at walking, since they spend a lot of time feeding on land, but you can still make out the waddle if you watch them for awhile.
Those awkward legs are great in the water though. The legs are quite far apart and the feet are webbed which makes waterfowl a graceful group of swimmers.