Zwerggans Upper Austria

The lesser white-fronted goose measures around 53 to 66 centimetres in length with a wingspan of 120 to 135 centimetres, making it the smallest of Europe's grey field geese. The most reliable field mark is the conspicuous lemon-yellow orbital ring, already visible in young birds after their first moult. Compared with the considerably larger greater white-fronted goose (around 65 to 80 centimetres), the lesser appears more compact and darker. Its white forehead blaze reaches further up and ends between the eyes, the belly is less heavily barred and the long primaries project beyond the tail tip when the bird is standing. These features matter for clean identification, because the risk of confusion with the greater white-fronted goose is high and can easily lead to fatal misidentified shots when birds mix in large flocks.

The breeding range stretches across the subarctic tundra and forest tundra of Eurasia, from northern Scandinavia through the Russian tundra east to the Anadyr region of the Far East. The species favours the willow and birch belt of the forest tundra, often in mountainous and rocky terrain with lakes and streams. Birds leave their breeding grounds between late August and early September, migrating across eastern Europe to wintering areas south of the Caspian Sea and along the western and southern Black Sea, with smaller numbers reaching Romania, Bulgaria, Greece and eastern Hungary. Spring migration begins in late March and early April. Within the DACH region, lesser white-fronted geese appear almost exclusively as exceptional vagrants embedded in flocks of greater white-fronted geese at the traditional staging sites of large goose passages.

The world population has crashed from an estimated several hundred thousand individuals in the 19th century to around 16,000 to 27,000 today. Habitat loss in the tundra and, above all, illegal and legal hunting along the flyway, in particular in Kazakhstan and around the Black Sea, are the main drivers. The Scandinavian breeding population had at times collapsed to only a few percent of its historical size. Reintroduction projects have been running in Sweden since the late 1970s and later in Finland, including the use of barnacle geese as foster parents and the teaching of new western European migration routes to young birds. In Germany the lesser white-fronted goose is listed under the Federal Hunting Act but enjoys a year-round closed season. Because of the immediate risk of confusion, several federal states have also placed the greater white-fronted goose on a year-round closed season so that the protection of the lesser white-fronted goose within mixed flocks is genuinely effective. For hunters in the field this means that every goose flock must be addressed carefully and that the shot should be withheld in any case of doubt.