Swan Goose (Anser cygnoides) lives in grass wetlands across East Asia, Europe. It feeds on grass and grains. Its conservation status is Endangered.
Fascinating facts about the Swan Goose
- The swan goose measures 81-94 cm from tip of bill to tail, which makes it the longest goose within the Anser genus. Adults weigh between 2.8 and 3.5 kg, giving them the second-heaviest body mass after the greylag goose. Their wingspan stretches 160-185 cm, supporting strong, sustained flight during migration. Both sexes look alike, although males are slightly larger with a longer bill and neck.
- Its bill is unusually long and heavy, measuring about 8.7-9.8 cm in males and 7.5-8.5 cm in females, and it is completely black - a trait unique among Anser geese. The stark black bill contrasts with the orange colour of its legs and feet, which are typical of its relatives. This combination of a heavy, dark bill and bright legs gives the swan goose a distinctive profile when it grazes on steppes and wetlands.
- The swan goose possesses a diploid chromosome number of 2n = 80, comprising four pairs of macrochromosomes and 35 pairs of microchromosomes together with its sex chromosomes. Among these, the two largest macrochromosome pairs and the Z chromosome are submetacentric, while the third-largest pair is acrocentric and the fourth-largest is metacentric.
- During winter, up to 60,000 swan geese gather at Chinese sites such as Lake Dongting and the Yancheng Coastal Wetlands, a number that may represent almost the entire world population. This massive congregation highlights its reliance on these habitats.
- In Russia, fewer than 500 breeding pairs are thought to survive, underscoring a severe regional decline. Elsewhere, numbers are uncertain, but the species remains endangered across its range.
Sources
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At a glance
RangeEast Asia, Europe
HabitatGrass wetlands
DietGrass and grains
About the Swan Goose
As the sun rises over the wetlands, the Swan Goose glides effortlessly across the landscape, its snowy plumage glistening like freshly fallen snow, its long neck held high in a majestic arc. With a gentle honking call, it leads its companions in a stately procession, their V-formation a testament to the ancient migrations that have shaped their very existence. In a world where their habitats are dwindling, the Swan Goose remains a poignant symbol of wild beauty, its endangered status a haunting reminder of the fragility of life in the natural world.
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