Definition of "greylag"

Since the war, migrant greylags have virtually deserted the Duddon estuary, so it is a source of great satisfaction that the WAGBI greylags have taken to roosting on the sands in mid-winter, flighting to and from the reserve.

1967, Jeffery G. Harrison, A Wealth of Wildfowl‎, page 150

Greylags used to concentrate on British estuaries, eating roots of rushes and sedges, as they do in other parts of their range.

2010, M. Owen, “Greylag Goose”, in Peter Lack, editor, The Atlas of Wintering Birds in Britain and Ireland, page 74

Earlier, 250 more had flown to Rattray beach, nearly all pinkfeet although I saw four greylags and heard others.

2012, Adam Watson, Ian Francis, Birds in North-East Scotland Then and Now, page 11