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The stiff-tailed ducks, the genus Oxyura, are part of the Oxyurini tribe of ducks.
All ducks in the genus have, as their name implies, long, stiff tail feathers which are erect when the bird is resting. They all have relatively large, swollen bills. These are freshwater diving ducks. Their legs are set far back, which makes them awkward on land and they rarely leave the water.