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A aquatic bird belonging to the genera Cygnus and Coscoroba is called a swan (Cygnini). They belong to the family Anatidae, which also includes the subfamilies of ducks and geese, the Anserinae.In colder regions like northern Europe, Asia, and North America, there are more swans. They are aquatic species. They eat plants that are on the bottom of ponds, lakes, and oceans while swimming on top of the water. Insects and other tiny creatures are also eaten by them. A cygnet is the name for a baby swan.Swans are tough, strong birds who will stand no nonsense from dogs or cats. They may open their wings as a warning, but from then on a person is advised to keep clear. Swans are highly protective of their nests. They will attack anything they see as a threat to their chicks, including humans.