Ducks differ from swans and geese in that they are smaller, have shorter feathers, and have limited flight distances. All ducks, which mature sexually within the first year, pair up only during the breeding season, unlike swans and geese, which mature later and pair up for life. According to the unique behaviors of ducks, ducks can be divided into three main groups: tealing ducks, diving ducks and perching ducks. The mallard is a typical teal duck and the ancestor of most domestic ducks. Roosting ducks such as the Moscow duck have long claws and are the most arboreal ducks. There are the most species of diving ducks (including marine ducks). Mallards fly from the south to the north to lay eggs in spring, and then fly to the south to overwinter in autumn. After they were domesticated by humans, they lost their ability to fly. A ducks eyes have a 360-degree field of vision, allowing them to see behind them without turning their heads.
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