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Swan Facts, species and Biology. Swans are large water birds of the family Anatidae, which also includes geese and ducks. Swans are grouped with the closely related geese in the subfamily Anserinae. Swans usually mate for life, though "divorce" does sometimes occur, particularly following nesting failure. The number of eggs in each clutch varies both within and among swan species, typically between 3-8 eggs. Young swans are known as cygnets, from the Latin word for swan, cygnus. The male and female adults are known as cob and pen, though these terms are little used nowadays. Species of swan. Whooper Swan, Cygnus cygnus breeds in Iceland and subarctic Europe and Asia, migrating to temperate Europe and Asia in winter. Trumpeter Swan, Cygnus buccinator is a North American species very similar to the Whooper Swan (and sometimes treated as a subspecies of it), which was hunted almost to extinction but has since recovered: it is one of the heaviest flying animals, at up to 17 kilograms (38 pounds). Whistling Swan, Cygnus columbianus is a relatively small swan which breeds on the North American tundra, further north than other swans. It winters in the USA. |
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