oie des moussons Haute-Savoie

The bean goose (formerly the single species Anser fabalis) has in recent years been split into two separate species: the taiga bean goose (Anser fabalis), tied to the boreal coniferous belt, and the tundra bean goose (Anser serrirostris), tied to the Arctic tundra. The two forms differ mainly in body size, bill shape and habitat preference, although they can only be reliably separated in the field with experience. The taiga bean goose is the larger and heavier form, with a longer, more slender bill and typically a broader orange bill band. The tundra bean goose is more compact, shorter-necked, with a shorter and blunter bill and usually a narrower orange band.

The breeding range of the taiga bean goose extends from Scandinavia across northern Finland and Karelia far into western Siberia. It prefers open taiga, mires, bog landscapes and forest tundra dotted with lakes, rivers and peatlands. The tundra bean goose breeds further north on the treeless tundra of northern Russia and Siberia, from the Kanin Peninsula in the west to the Taimyr Peninsula in the east. Both species are exclusively ground nesters in open or semi-open terrain. Taiga bean goose populations are declining across Europe and are now considered one of the few decreasing goose populations in the Western Palearctic.

Migration patterns differ markedly between the two species. The tundra bean goose is by far the more numerous form staging and wintering in Central Europe. The main passage reaches Germany in October and November, with a large share of the western Siberian population crossing the Baltic and the eastern European flyway towards the Netherlands, Denmark and northern Germany. The taiga bean goose follows a more easterly route and today appears in Germany only in a few traditional staging areas, mainly in the north-east. Both species travel in V-formations and commute daily between roost waters and feeding grounds.

Wintering grounds in the DACH region are concentrated in the lowlands of northern Germany, in the large river valleys and around major reservoirs. By day the flocks move out onto harvested maize, cereal and root-crop fields, feeding on stubble, residual grain, beet and potato remnants, roots and shoots. Where stubble fields have been ploughed in, they switch to oilseed rape and winter cereals. For roosting they seek out open, undisturbed water bodies, ideally large lakes, shallow zones, polders and quiet river stretches. The morning and evening flight lines between roost and feeding fields are highly characteristic and audible from a distance in calm weather.

From a hunting perspective the bean goose is classic cold-season migratory quarry. In the DACH region it is hunted primarily on roost flight lines, morning flights and on the feeding fields, often over full-body decoys and with call work. Correct identification before the shot is critical, because bean geese typically mix with white-fronted geese and greylag geese, occasionally also with barnacle and pink-footed geese. The risk of confusion with non-quarry or differently regulated species is significant, so species identification is an inseparable part of any goose hunt. Open seasons, closed seasons and protected status differ by federal state, region and current ordinance. Hunters must always check the applicable state law and local regulation before going afield.

The key field marks for separating bean goose from its main confusion species are as follows. The white-fronted goose, as an adult, carries a conspicuous white blaze above the bill and irregular black barring across breast and belly, and its bill is uniformly pink to flesh-coloured. The bean goose, by contrast, shows a dark head without any white blaze and a clearly bicoloured black-and-orange bill. The greylag goose is overall noticeably paler and greyer and is recognised in flight by its strikingly light grey forewings, its bill is uniformly pink to orange with no black areas. Voice helps as well: the bean goose calls in a deeper, more muffled tone than the higher, multi-syllabic white-front and the nasal, noisy greylag. Checking bill pattern, head colour and overall proportions together in a flock allows the bean goose to be told apart reliably from its commonest look-alikes.