The greylag goose is a large species of goose in the waterfowl family Anatidae and the type species of the genus Anser. The greylag is the largest and bulkiest of the grey geese of the genus Anser, but is more lightly built and agile than its domestic relative. It has a rotund, bulky body, a thick and long neck, and a large head and bill. It has pink legs and feet, and an orange or pink bill with a white or brown nail hard material at tip of upper mandible. The plumage of the greylag goose is greyish-brown, with a darker head and paler breast and belly with a variable amount of black spotting. It has a pale grey fore-wing and rump which are noticeable when the bird is in flight or stretches its wings on the ground. It has a white line bordering its upper flanks, and its wing coverts are light-coloured, contrasting with its darker flight feathers. Its plumage is patterned by the pale fringes of the feathers. Juveniles differ mostly in their lack of black-speckling on the breast and belly and by their greyish legs. Adults have a distinctive `concertina` pattern of folds in the feathers on their necks.

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