Greylag Goose (Anser anser) lives in wet grasslands across Europe, Asia, Africa. It feeds on grass and leaves. Its conservation status is Least Concern.
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A greylag goose can stretch from a kitchen table to a small car: it measures between 74 and 91 cm (29-36 in) long and weighs on average 3.3 kg (7 lb 4 oz), while its wings span 147-180 cm (58-71 in). In the wild the typical adult is about 80 cm (31 in) long and tips the scales at 2.5-4.1 kg, matching the same wingspan range. Those dimensions make it the biggest of the grey Anser geese.
Greylag geese form bonds that last a lifetime, yet 5-8 % of couples split and find new mates. They are monogamous, with 5-8 % of pairs separating and re-pairing, while same-sex partnerships are even more common, making up 14-20 % of pairs. These bonds are not just romance; they boost flock hierarchy, with gay pairs often becoming high-ranking guardians. The flexibility of their relationships shows how social structure can evolve beyond simple male-female pairings.
A female greylag lays a clutch of three-to-five eggs, each about 85 × 58 mm, and sits on them for roughly 27-28 days while the male guards the nest. The eggs are creamy-white, turning stained as incubation proceeds. After hatching, the precocial goslings leave the nest soon after hatching and are fully fledged by eight-to-nine weeks, just as the parents regain flight after their own molt.
Since the 1950s milder winters have let greylags breed farther north, cutting their traditional southward trek. Birds that once flew from Iceland to the British Isles now often stay in Scandinavia year-round, letting them claim breeding territories earlier in spring. Shorter migrations bring them into closer contact with farmers, turning a once-remote bird into a local pest in many regions.
The greylag is the wild ancestor of most domestic geese, a lineage that began at least by 1360 BCE in Ancient Egypt. Its early taming made it a cultural icon: Romans declared the bird sacred after it sounded the alarm during the Gaul attack of 390 BC, and Konrad Lorenz later used greylags to reveal imprinting in young birds. These historic ties show how a common waterfowl shaped mythology, agriculture, and modern science.
Sources
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As the sun rises over the wetlands, the greylag goose emerges, its soft grey plumage glistening with dew, as it waddles purposefully across the landscape, its webbed feet leaving gentle impressions in the mud. With a gentle honking call, it takes to the skies, its broad wings beating in a slow, powerful rhythm, propelling it effortlessly across the landscape in a majestic display of avian elegance. In its annual migrations, the greylag goose traverses vast distances, a testament to its remarkable endurance and navigational prowess, as it follows the ancient flyways that have guided its ancestors for centuries.
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