The mallard duck is a common species of dabbling duck that is found throughout the world in a variety of wetland habitats, including lakes, rivers, ponds, and marshes. The male mallard has a distinctive green head, yellow bill, and rusty brown chest, while the female has a mottled brown plumage with an orange bill. Both sexes have a characteristic iridescent blue patch on their wings.
Mallard ducks are omnivorous and feed on a variety of foods, including aquatic plants, insects, crustaceans, and small fish. They are known for their dabbling behavior, in which they tip their head underwater and use their bill to forage for food. They are also able to dive underwater for short periods of time to search for food.
Mallard ducks are an important game bird and are also commonly kept in captivity for ornamental purposes. They are social birds and form pairs during breeding season, typically from late winter to early spring. They build nests on the ground, often in dense vegetation near water, and the female lays a clutch of eggs that hatch after about a month. Mallard ducks are an iconic species of waterfowl and are enjoyed by birdwatchers and nature enthusiasts alike.
Ducks do not have teeth in the traditional sense like humans or other mammals. However, they have serrated edges or tooth-like structures called "tomia" along the edges of their bills. These structures help them filter food from water and grip slippery prey, such as fish or insects.