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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.

The Northern Hemisphere species of swan are all pure white in plumage, but the Southern Hemisphere species are all patterned with various amounts of black. The Australian Black Swan (Cygnus atratus) is blackest, black all over except for the white flight feathers on its wings, and the South AmericaSouth America is a continent crossed by the equator, with most of its area in the Southern Hemisphere. South America is situated between the Pacific Ocean and the Atlantic Ocean. It became attached to North America only recently, geologically speaking, win Black-necked Swan has, as its name suggests, a black neck; finally, the Coscoroba Swan, also from southern South America, has black tips to the primary feathers. The legs of all swans are dark blackish grey, except for the two South American species, which have pink legs. Bill colour varies rather more; the three far northern species have black bills with varying amounts of yellow, and all the others varyingly patterned red and black. The Mute Swan and Black-necked Swan have a curious lump at the base of the bill on the upper mandible.

1 Species of swan

Genus Cygnus

• Whooper SwanWhooper Swan : Animalia : Chordata : Aves : Anseriformes : Anatidae Cygnus cygnus Binomial name ''Cygnus cygnus ( Linnaeus, 1758) Whooper Swan Cygnus cygnus is a large Northern Hemisphere swan. It is the Old World counterpart of the North American Trumpet, Cygnus cygnus breeds in IcelandThe Republic of Iceland is an island nation in the northern Atlantic Ocean, located between Greenland and Scotland, northwest of the Faroe Islands. Lydveldid Island ( In Detail) (Full size) National motto: none Official languageNone. Icelandic de facto''. and subarctic EuropeFor the band of the same name, see Europe (band . Europe is a continent forming the westermost part of the Eurasian supercontinent. Europe is bounded to the north by the Arctic Ocean, to the west by the Atlantic Ocean, to the south by the Mediterranean Se and AsiaThe continent of Asia is defined by subtracting Europe and Africa from the great land mass of Africa-Eurasia. The boundaries are vague, especially between Asia and Europe: Asia and Africa meet somewhere near the Suez Canal. The boundary between Asia and E, 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 race 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).
• Tundra Swan, Cygnus columbianus is a relatively small swan which has two major subspecies (sometimes treated as a distinct species); as the name suggests, it breeds on the Arctic tundra, further north than other swans.
  • Bewick's Swan, Cygnus columbianus bewickii is the Eurasian form which migrates from Arctic Russia to western Europe and eastern Asia ( China, Japan) in winter. The reserves of the Royal Society for the Protection of Birds and of the Wildfowl and Wetlands Trust in Britain are important for Bewick's and Whooper Swans.
  • Whistling Swan, Cygnus columbianus columbianus is the North American race, which is sometimes considered a separate species from Bewick's swan.
• Black Swan, Cygnus atratus of Australia, and introduced in New Zealand. The Black Swan is the official state emblem of Western Australia.
• Black-necked Swan, Cygnus melanocoryphus of South America, formerly Sthenelides melanocorypha.
• Mute Swan, Cygnus olor, is a common temperate Eurasian species, often semi-domesticated; descendants of domestic flocks are naturalized in the United States and elsewhere.

Genus Coscoroba

• Coscoroba Swan, Coscoroba coscoroba, also of South America

Once swans were considered an edible form of poultry. Nowadays they are protected species in many countries. In Britain, for example, all unmarked swans in open water are considered the property of the monarch and are protected by law. However, they may be taken for food under some circumstances, and roast swan is a traditional item at celebratory dinners in certain Oxbridge colleges. Swans are also owned by the Vintners' and Dyers' Livery Companies. The Swan Upping cermony takes place each July on the River Thames, to count and weigh the swans.

The noise a swan makes is uniquely known as a "beable", but this word has fallen into disuse in all but a few parts of Britain.

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Topics: Swan Cygnus Swans Species Black Coscoroba South Columbianus...

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