Their webbed feet act like paddles for the ducks. A duck waddles instead of walk because of its webbed feet. Another special thing that the duck has is its water-proof feathers. There is a special gland that produces oil near the duck's tail which spreads and covers the outer coat of the duck's feathers, making it water-proof. Beneath the water-proof coat are fluffy and soft feathers to keep the duck warm.
Ducks keep clean by preening themselves.
They do this by putting their heads in funny positions and putting their beaks into their body. They preen themselves very often. Ducks give out a special sound. Listen to the sound of ducks quacking here. However, not all ducks quack.