Swan Goose

Identification

The swan goose is a large and long-necked goose, among the longest in its genus at 81–94 cm, with a distinctive appearance that sets it apart from other Anser geese. Males are noticeably larger than females, with proportionally longer bills and necks. The plumage features greyish-brown upperparts with a striking maroon hindneck and cap that reaches just below the eye, contrasting sharply with the pale buff underside, particularly on the lower head and foreneck. The remiges and underwing are blackish, while the rectrices are white-tipped. Uniquely among its genus, the swan goose has a completely black bill, whereas most relatives have orange legs and feet. The eyes display maroon irides, and a thin white stripe encircles the bill base. In flight, the wings appear uniformly dark without conspicuous patterning. Juveniles are duller and lack the distinctive white bill base and dark belly streaks of adults. The species produces a loud, drawn-out and ascending honking call, with a more barking variant used as a warning.

Range & Habitat

The swan goose has a natural breeding range in inland Mongolia, Northeast China, and the Russian Far East, where it inhabits steppe to taiga and mountain valleys near freshwater. It is highly migratory, wintering mainly in central and eastern China, particularly around Lake Dongting, Lake Poyang, the Yancheng Coastal Wetlands, and the lower Yangtze River region. Vagrant birds are occasionally encountered in Japan, Korea, Kazakhstan, Laos, coastal Siberia, Taiwan, Thailand, and Uzbekistan. The species has been extensively domesticated as the Chinese goose, and introduced and feral populations now occur in many places outside its natural range.

Behaviour & Diet

Swan geese are grazers, feeding primarily on sedges, grasses, and water plants, and rarely swimming. They form small flocks outside the breeding season, grazing on plains and stubble fields in winter, sometimes far from water. The breeding season begins around May, with birds returning from winter quarters in April. They breed as single pairs or loose groups near marshes and other wetlands, constructing shallow nests from plants directly on the ground, often on small knolls to maintain dryness. Clutches typically contain 5–6 eggs, though sometimes up to 8. The precocial young hatch after approximately 28 days and reach sexual maturity at 2–3 years of age. In late August and early September, birds depart for winter quarters, where they gather in small groups to moult.

Best Time & Places to See It

The swan goose is uncommon in the wild, with fewer than 500 pairs possibly remaining in Russia and unknown numbers in Mongolia. The most reliable locations for viewing are the wintering grounds in central and eastern China, where approximately 60,000 individuals may be found annually, potentially representing nearly the entire world population. Important wintering sites include Lake Dongting, Lake Poyang, and the Yancheng Coastal Wetlands. Birds return to breeding areas around April and depart for winter quarters in late August and early September. Once present in Japan and Korea in greater numbers, the species is now rarely encountered there due to habitat destruction, though vagrant sightings remain possible.

Photography Tips

Photographing swan geese requires patience, as the species is uncommon and often wary. The distinctive maroon cap and hindneck provide excellent identification markers and photographic subjects. The completely black bill, orange legs, and contrasting pale underside create striking compositional elements. Winter flocking behaviour in key Chinese wetlands offers opportunities for capturing group dynamics. The birds' large size and long necks are best showcased in profile shots. In flight, the uniformly dark wings become visible, though the lack of conspicuous wing patterns means that ground and water settings are preferable for highlighting the bird's distinctive plumage. Early morning and late afternoon light will enhance the rich maroon tones of the head and the subtle greyish-brown of the upperparts.