Tundra Bean Goose (Anser serrirostris)

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Image of a Tundra Bean Goose in its natural habitat
Birds Goose

Introduction

The Tundra Bean Goose, Anser serrirostris, is a migratory goose in the family Anatidae. It breeds across Arctic and sub-Arctic tundra in northern Eurasia, particularly Siberia, and migrates south to wintering areas in Europe and parts of Asia. It was formerly treated as part of a wider Bean Goose complex, but is recognised as a separate species by the IOC World Bird List and the American Ornithological Society.

Physical Description

The Tundra Bean Goose is a medium to large, robust grey goose. Adults generally measure about 66–90 centimetres in length, with a wingspan of approximately 140–174 centimetres. Body mass varies with sex and subspecies, but adults commonly weigh around 3 kilograms.

The plumage is mainly brownish-grey, with darker brown upperparts, a paler breast and belly, and fine pale edging on the upperwing feathers. The head and neck are often noticeably darker than those of the Greylag Goose. The legs and feet are orange.

The bill is largely dark, with a relatively narrow orange or yellow-orange band across the middle. Bill shape and the size and position of the orange band vary geographically. The western form, A. s. rossicus, is smaller and has a shorter, more compact bill than the larger eastern form, A. s. serrirostris.

Males and females are similar in appearance, although males are usually slightly larger. Juveniles resemble adults but tend to show less distinct plumage contrast and barring during their first year.

Range and Habitat

The Tundra Bean Goose breeds in Arctic and sub-Arctic Eurasia, from northern Russia eastwards across Siberia. Breeding habitat includes low-lying tundra, river valleys, wet meadows, marshes and the margins of shallow lakes and streams. Recent field research from the Taimyr region indicates that nesting birds are particularly associated with rivers and creeks.

It is a long-distance migrant. After breeding, birds move south and west to winter in Europe and East Asia. In Europe, wintering birds use coastal marshes, estuaries, freshwater wetlands, grasslands and agricultural fields, where they may feed on pasture, crop stubble and other low vegetation. Winter distribution and numbers vary considerably between years, partly because cold weather can displace birds farther south and west.

Two subspecies are commonly recognised: the smaller western A. s. rossicus and the larger eastern nominate form, A. s. serrirostris. Taxonomic treatments of the Bean Goose complex have changed over time, so older sources may refer to the Tundra Bean Goose as Anser fabalis rossicus or include it within a broadly defined Bean Goose.

Behaviour and Diet

Tundra Bean Geese are social outside the breeding season and usually occur in pairs, family groups or flocks. They often associate with other large grey geese while resting or feeding. Their flight is strong and direct, and they use traditional migration routes between northern breeding grounds and southern wintering areas.

The species is primarily herbivorous. Its diet includes grasses, sedges, roots, leaves, seeds and other plant material. During migration and winter, it commonly feeds on pasture and agricultural land, including cereal grains, crop residues and stubble. This behaviour can bring flocks into contact with farming operations and may contribute to local conflicts where geese concentrate in cultivated areas.

Breeding begins during the short Arctic summer. The nest is built on the ground, usually in a concealed site near water. A typical clutch contains about four to six eggs. The female performs the main incubation, while the male remains close to the nest and helps defend the territory. The young are precocial, leaving the nest soon after hatching under the care of both parents. They grow rapidly during the brief breeding season and become capable of flight before autumn migration.

Identification Tips

  • Look for a stocky, dark brown-grey goose with orange legs and a dark head and neck.
  • The bill is black at the base and tip, with a relatively narrow orange band across the middle.
  • Compared with a Greylag Goose, the Tundra Bean Goose usually appears darker overall, with darker upperwings, a darker rump and a more extensively dark tail in flight.
  • Compared with a Taiga Bean Goose, it is generally smaller and stockier, with a shorter neck and a smaller orange bill patch. Identification can be difficult, particularly where the two forms occur together.
  • A Pink-footed Goose is usually distinguished by its pink rather than orange legs and by its shorter bill with a pink central band.
  • A Greater White-fronted Goose has a conspicuous white forehead and usually black belly bars, features not shown by a typical Tundra Bean Goose.

Close views of the bill pattern, leg colour, body proportions and wing pattern are often needed for a confident identification. Photographs and comparisons with a known Taiga Bean Goose can be especially helpful.

Conservation Status

The Tundra Bean Goose is generally treated as Least Concern in broad global assessments of the Bean Goose group, although assessment boundaries differ because some conservation databases have historically combined Tundra and Taiga Bean Geese. The species is considered stable in the Western Palearctic, but detailed global population trends remain limited.

Important pressures include hunting, disturbance, degradation of wetlands and grasslands, and changes in agricultural land use. Climate change may also alter tundra breeding conditions, migration timing, winter distribution and the availability of suitable stopover sites. Effective conservation depends on protecting wetlands and important feeding areas across the flyway, maintaining suitable breeding habitat and applying coordinated, sustainable hunting regulations.

Frequently Asked Questions

Where does the Tundra Bean Goose breed?

It breeds in Arctic and sub-Arctic tundra across northern Russia and Siberia, particularly in wet lowland areas near rivers, streams, lakes and marshes.

Where does the Tundra Bean Goose spend winter?

It winters mainly in Europe and East Asia, using coastal marshes, estuaries, wetlands, grasslands and agricultural fields. Winter numbers and locations vary between years.

How can a Tundra Bean Goose be identified?

Look for a dark brown-grey, stocky goose with orange legs, a dark-tipped bill and a relatively narrow orange band across the middle of the bill. It is generally darker and smaller-looking than a Taiga Bean Goose.

What does the Tundra Bean Goose eat?

Its diet consists mainly of grasses, sedges, roots, leaves, seeds, cereal grains and crop residues. It often feeds on pasture and stubble fields during migration and winter.

Is the Tundra Bean Goose endangered?

It is not generally considered globally endangered and is usually treated as Least Concern in broad global assessments. However, hunting, habitat degradation, disturbance and climate-related changes remain important conservation concerns.

References

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