Giant waterfowl that usually pair for life
Cygnus swans are the largest living Anatidae and among the biggest flying birds in their ranges. Mute, trumpeter, and whooper birds can exceed 1.5 metres and fifteen kilograms with wingspans past 3.1 metres, yet folklore still muddles who owns Britain’s birds and whether they all mate forever.
François Alexandre Pierre de Garsault introduced the genus Cygnus in 1764. English swan shares an Indo-European root meaning to sound or sing; young are cygnets, males cobs, females pens, and gatherings bevies or wedges. Six living true swan species remain; the South American coscoroba is no longer counted among them. Northern species wear pure white plumage, while southern forms mix black and white—Australia’s black swan is nearly all black save white flight feathers.
They favor temperate waters and skip tropical Asia, Central America, much of northern South America, and Africa entirely. Mute swans are partial migrants; tundra swans migrate wholly; whoopers and trumpeters nearly so. Diets are almost wholly plant roots, tubers, stems, and leaves taken by dabbling or up-ending. Pair bonds often form before sexual maturity—trumpeters may live twenty-four years, start breeding at four to seven, and pair as early as twenty months—yet mute-swan studies record divorce rates near three percent after successful nests and nine percent after failure.
Nests sit on the ground near water, about a metre across; males help build and share incubation, a rare habit among ducks and geese shared with whistling ducks. Mute-swan eggs average about 113 by 74 millimetres and 340 grams in clutches of four to seven. Fossils such as Malta’s giant Cygnus falconeri and New Zealand’s extinct Cygnus sumnerensis show the lineage once ranged farther. Culture leans on mute-swan imagery, from Wagner’s Lohengrin to the classical swan song and Juvenal’s rara avis jab before Dutch explorers met real black swans in Australia.
Source: Swan
