Examples include mallards, wigeon, Greylag geese, herons and coots. Tufted duck, goldeneye, wigeon, teal and possibly goosander with sometimes smew and scaup. The marshes also support wintering wildfowl and waders, including shelduck, wigeon, teal and curlew. Winter visitors include brent geese, wigeon, pintail and many species of wading birds. Primary upland nesting species include the mallard, pintail, gadwall, and American wigeon. The lakes provide habitat for heron, coot, tufted duck, pochard, wigeon and great-crested grebe. Thousands of Eurasian wigeon, northern pintail, northern shoveller also use the backwaters. The favourites on the table are mallard, wigeon and teal. American wigeon ("Mareca americana") and green-winged teal ("Anas crecca"). The female falcated duck is dark brown, with plumage much like a female wigeon. They can be distinguished from most ducks, apart from Eurasian wigeon, by shape. The female is light brown, with plumage much like a female American wigeon. It can be distinguished from most other ducks, apart from American wigeon, on shape. The type species is the Eurasian wigeon. There are three extant species of wigeon, in addition to one recently extinct species.