Family Ducks, Geese, Swans (Anatidae)


Swan Goose (Anser cygnoid)


French: Oie cygnoïde German: Schwanengans Spanish: Ánsar cisnal

Anas Cygnoid


, 1758,



Sometimes placed in monospecific genus Cygnopsis. In past, specific name normally given as cygnoides, but internal evidence does not justify this emendation#R. Monotypic.


C Asia from SC Siberia to Mongolia and N China; recorded in E Kazakhstan and Turkmenistan and breeding is suspected in NE North Korea#R. Winters in North Korea, South Korea, CE China, and occasionally in Japan and Taiwan.

Descriptive notes

80–94 cm; male c. 3500 g, female 2850–3450 g; wingspan 165–185 cm. Easily recognized by pattern and shape of head and bill. Female slightly smaller with... read more


Commonest vocalization is a prolonged, resounding, ascending honk, whereas “Triumph Display” is low... read more


Varied, generally in close association with water, brackish or fresh (rivers or lakes); also in... read more

Food and feeding

Almost exclusively vegetarian diet, partly consisting of sedges, but comparatively few data. In summer grasses are apparently important,... read more


Starts latter half of Apr, sometimes not until late May; hatching mainly late May/June and most young have fledged by late Aug. Pair... read more


Migratory, winters mainly in E China and in Korea, formerly also in Japan where now very rare.... read more

Status and conservation

VULNERABLE. Previously considered Near Threatened, and was briefly uplisted to Endangered in early 2000s. Legally protected in Russia, Mongolia, South Korea and some... read more

Recommended citation

Carboneras, C. & Kirwan, G.M. (2019). Swan Goose (Anser cygnoid). In: del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona. (retrieved from on 7 December 2019).