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Ducks are mainly aquatic birds. They feed on a variety of food sources such as grasses, aquatic plants, fish and insects. Ducks are generally monogamous. Most species breed once a year, choosing to do so in favourable conditions mostly in spring or summer. Worldwide, ducks have many predators, with ducklings being particularly vulnerable since their inability to fly makes them easy prey for predatory birds, some species of large fish and also crocodiles.

Ducks have many economic uses, being farmed for their meat and eggs. They are also kept and bred by aviculturists and often displayed in zoos. The word "duck" may have become an inherently funny word in many languages, possibly because ducks are often seen as silly in their looks or behaviour. Also possibly because of the association with the cartoon character Donald Duck from the Walt Disney film.