Update: January 4th 2022, following the TWSG website
The IUCN SSC Threatened Waterfowl Specialist Group (TWSG) identifies which Anseriformes taxa are globally threatened, monitors their status, produces international action plans and exchanges information on conservation projects on globally threatened Anseriformes and encourages contacts between everyone working with or enthusiastic about these ducks, geese, swans and screamers. To date (2020), the TWSG has helped bring about major advances in the conservation of many threatened waterfowl, such as the Hawaiian goose, red-breasted goose, white-headed duck, white-winged duck, Madagascar pochard and scaly-sided merganser.
TWSG is primarily interested in the species, subspecies and populations of Anseriformes listed below, but keeps watch over every family member:
The IUCN category Extinct includes species extinct since 1500.
New Zealand Swan Cygnus sumnerensis
Mauritian Shelduck Alopochen mauritiana
Réunion Shelduck Mascarenachen kervazoi
Chatham Island Duck Pachyanas chathamica
Finsch’s Duck Chenonetta finschi
Mauritian Duck Anas theodori
Amsterdam Island Duck Anas marecula
Labrador Duck Camptorhynchus labradorius
Auckland Islands Merganser Mergus australis
Crested Shelduck Tadorna cristata
Laysan Teal Anas laysanensis
Pink-headed Duck Rhodonessa caryophyllacea
Baer’s Pochard Aythya baeri
Madagascar Pochard Aythya innotata
Brazilian Merganser Mergus octosetaceus
Blue Duck Hymenolaimus malacorhynchos
White-winged Duck Cairina scutulata
Scaly-sided Merganser Mergus squamatus
White-headed Duck Oxyura leucocephala
Lesser White-fronted Goose Anser erythropus
Red-breasted Goose Branta ruficollis
Blue-winged Goose Cyanochen cyanoptera
White-headed Steamer Duck Tachyeres leucocephalus
Eaton’s Pintail Anas eatoni
Philippine Duck Anas luzonica
Andaman Teal Anas albogularis
Campbell Islands Teal Anas nesiotis
Marbled Teal Marmaronetta angustirostris
Steller’s Eider Polysticta stelleri
Long-tailed Duck Clangula hyemalis
West Indian Whistling-duck Dendrocygna arborea
Hawaiian Goose Branta sandvicensis
Northern Screamer Chauna chavaria
Orinoco Goose Oressochen (Neochen) jubata
Auckland Island Teal Anas aucklandica
Spectacled Duck Speculanas specularis
Ferruginous Duck Aythya nyroca
Black Scoter Melanitta americana
Common Eider Somateria mollissima
Spectacled Eider Somateria fischeri
Blue-billed Duck Oxyura australis
(only those species that were previously listed in a higher category are shown here)
Comb Duck Sarkidiornis sylvicola
Baikal Teal Sibrionetta formosa
Stejneger’s Scoter Melanitta stejnegeri (as Asiatic White-winged Scoter Melanitta fusca deglandi)
Salvadori's teal, Salvadorina waigiuensis
Coue's Gadwall Mareca strepera couesi
Mariana Mallard Anas platyrhynchos oustaleti
Rennell Island Grey Teal Anas gracilis remissa
Chatham Island Teal Anas chlorotis ssp. nov
Niceforo’s Pintail Anas georgica niceforoi
Borrero’s Cinnamon Teal Anas cyanoptera borreroi
Madagascar White-backed Duck Thalassornis leuconotus insularis
Tropical Cinnamon Teal Anas cyanoptera tropica
Galapagos Pintail Anas bahamensis galapagensis
Crozet Islands Pintail Anas eatoni drygalskii
Colombian Andean Duck Oxyura ferruginea andina
Recherche Cape Barren Goose Cereopsis novaehollandiae grisea
Middendorf's Bean Goose Anser fabalis middendorffi
Thick-billed Bean Goose Anser serrirostris serrirostris
Tule Greater White-fronted Goose Anser albifrons elgasi
Dusky Canada Goose Branta canadensis occidentalis
Peruvian Torrent Duck Merganetta armata leucogenis
Colombian Torrent Duck Merganetta armata colombiana
Australian Cotton Pygmy Goose Nettapus coromandelianus albipennis
Merida Teal Anas andium altipetens
Kerguelen Pintail Anas eatoni eatoni
Florida Mottled Duck Anas fulvigula fulvigula
Australian Black Duck Anas superciliosa rogersi
Lesser Grey Duck Anas superciliosa pelewensis
Andean Teal Anas andium andium
South Georgia Pintail Anas georgica georgica
South American Pochard Netta erythropthalma erythropthalma
Pacific Eider Somateria mollissima v-nigrum
(only those species that were previously listed in a higher category are shown here)
Stejneger’s Scoter Melanitta stejnegeri (in last TWSG list as Asiatic White-winged Scoter Melanitta fusca deglandi)
Not evaluated
Ruddy-headed Goose Chloephaga rubidiceps Mainland South America
None
Black-necked Swan Cygnus melanocorypha Falkland Islands
Comb Duck Sarkidiornis melanotus S/SE Asia
Chiloe Wigeon Anas sibilatrix Falkland Islands
Harlequin Duck Histrionicus histrionicus Atlantic Basin
Barrow’s Goldeneye Bucephala islandica Iceland (population in recent review is stable)
Fulvous Whistling Duck Dendrocygna bicolor S Asia
Brent Goose Branta bernicla Parry Islands/Puget Sound
Yellow-billed Pintail Anas georgica Falkland Islands
Silver Teal Anas versicolor Falkland Islands
Harlequin Duck Histrionicus histrionicus Pacific
Barrow’s Goldeneye Bucephala islandica Greenland/Eastern North America