Greylag GooseAnser anserWhere and when to see them

The Greylag Goose is a large, grey-brown waterbird native to Europe and parts of Asia. It is a familiar sight on the Rhine, where it uses floodplain wetlands, sheltered waters and nearby grassland. Some populations migrate, while others remain in the same region throughout the year. This species is the principal wild ancestor of most European domestic goose breeds. Its loud, honking calls often announce a flock before it comes into view.

Size

74–91 cm long, with a wingspan of 147–180 cm.

Weight

Usually 2–4.5 kg.

Lifespan

Can live for more than 20 years in the wild.

Status

Least Concern (IUCN).

Greylag Geese are social birds that gather in flocks outside the breeding season. Pairs commonly form long-lasting bonds, and family groups may remain together through autumn and winter. During breeding, pairs defend the immediate area around their nest. The female incubates the eggs while the male stays nearby and watches for danger. Goslings leave the nest soon after hatching and feed themselves under the protection of both parents. Adults replace their flight feathers simultaneously after breeding and become temporarily flightless. Travelling flocks often fly in lines or V-shaped formations, keeping in contact with repeated calls.

• Most European domestic goose breeds descend from Greylag Geese.
• Young geese can walk, swim and feed themselves soon after hatching.
• Adults temporarily lose the ability to fly during their annual wing moult.
• Both parents protect and guide their goslings.

Wildlife opportunities depend on the river reach, water levels and species. River-specific viewing months have not been confirmed; general species seasons are not a local sighting forecast.

Greylag Geese favour wetlands with open water, secure nesting places and accessible feeding grounds. Along the Rhine, suitable habitats include floodplain lakes, backwaters, gravel pits and quiet river margins. Reedbeds, vegetated islands and secluded banks can provide nesting cover. They frequently graze on nearby meadows, pasture and agricultural fields. Urban parks and managed lakes also support birds where disturbance is limited and food is available.

The diet is predominantly plant-based, especially grasses, leaves and shoots. Greylag Geese also eat aquatic vegetation, roots, seeds and grain. They commonly feed by grazing on land, using their strong bills to crop vegetation. On farmland, they may take crop seedlings or grain left after harvest.

Common name

Greylag Goose

Scientific name

Anser anser

Animal group

Birds

Size

74–91 cm long, with a wingspan of 147–180 cm.

Weight

Usually 2–4.5 kg.

Lifespan

Can live for more than 20 years in the wild.

Status

Least Concern (IUCN).

Identification

Look for a bulky grey-brown goose with a stout neck, pink legs and a large orange to pink bill. The head and neck are relatively pale, while the back and flanks show pale feather edges. In flight, the pale grey forewings contrast with darker flight feathers, and the rump is pale. Compared with Greater White-fronted Geese, adults lack a white patch around the bill base and usually lack bold black belly bars.