Ducks are aquatic birds that belong to the family Anatidae. They are found in a wide range of habitats, including wetlands, rivers, lakes, and even in urban areas such as parks and ponds. They have a broad, flat beak, webbed feet, and a streamlined body that makes them excellent swimmers. Ducks are known for their distinctive quacking sound, and they are also popular as domesticated animals due to their meat, eggs, and feathers.