Ducks are birds. They are related to geese and swans. The duck is the smallest of them all.
Ducks also have shorter necks and wings and a stout body.
They can live from 2-12 years, depending on species. Ducks have webbed feet, designed for swimming. 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.