duck

Ducks are waterfowl in the family Anatidae, a group that includes true ducks, geese, and swans. The term duck typically refers to species in the subfamily Anatinae and closely related groups. They are found worldwide, from temperate wetlands to tropical ponds, with many species adapting to urban environments. Ducks generally have a broad, flattened bill, short legs positioned toward the rear of the body, and webbed feet. Their feathers are water-repellent thanks to preen oil produced by the uropygial gland.

Ducks are largely omnivorous, feeding on aquatic plants, seeds, and small invertebrates. Some dabbling species feed mainly at the surface, tipping forward to reach vegetation, while divers pursue food underwater. The feeding strategy varies with species and habitat.

Reproduction varies by species but many form breeding pairs and nest near water. The female incubates eggs for roughly two to five weeks, depending on the species, and ducklings can swim and feed shortly after hatching. Migration patterns range from resident populations to long-distance travelers.

Domestic ducks are descended primarily from the wild mallard and have been kept for meat, eggs, and feathers, as well as for ornamental purposes. In the wild, ducks play important ecological roles as grazers of aquatic vegetation and as indicators of wetland health. Some species, however, face threats from habitat loss, hunting, pollution, and disease.