Anserinae Anser anser graylag goose A large bird in the waterfowl family Anatidae. It has mottled and barred grey and white plumage and an orange beak and legs. It measures between 74 and 91 centimetres (29 and 36 in) in length, with an average weight of 3.3 kilograms (7.3 lb). Anser anser domesticus greylag goose Domestic goose Anser anser (Linnaeus, 1758) greylag goose ready for release