These habitats were primarily for mallard, gadwall, and Canada goose. This includes Bewick's swans, wigeon, gadwall and shoveller. Primary upland nesting species include the mallard, pintail, gadwall, and American wigeon. The Brewer's duck is an intergeneric hybrid between a mallard and a gadwall. Only occasionally seen are garganey, common kingfisher, osprey, and gadwall. The gadwall is long with a wingspan. Nationally important wintering populations are supported such as gadwall, shoveller and pochard. In winter brambling, fieldfare, wigeon, gadwall, pochard and teal may be sighted. The closest relative of this species is the gadwall, followed by the wigeons. Birds taken by Prut wildcats include warblers, ferruginous duck, Eurasian coot, spotted crake, and gadwall. It received the name "Gadwall", and was allocated to Gateshead shed on completion. Bird species include gadwall, shoveler, pochard, tufted duck, grey heron and mute swans. Also present are smaller numbers of pintail, gadwall, shelduck, tufted duck and pochard. The gadwall is a quieter duck, except during its courtship display. The gadwall ("Mareca strepera") is a common and widespread dabbling duck in the family Anatidae.