Species

TWSG is primarily interested in the following species, subspecies and populations of Anseriformes but keeps watch over every family member:

Extinct

The IUCN category Extinct includes species extinct since 1500 (below in bold)
http://datazone.birdlife.org/species/spcextinct

TWSG wants to further highlight those, island, species that became extinct following human contact, even before 1500 (see Hume, J. 2017. Extinct Birds. 2nd Edition. Bloomsbury Natural History).
Location is given for extinct species to show full extent of losses and to guide anyone unfamiliar with these taxa.

North Island Goose Cnemiornis gracilis New Zealand
South Island Goose Cnemiornis calcitrans New Zealand
Giant Hawaiian Goose Branta rhuax Hawaii
Greater Hawaiian Goose (Nene-nui) Branta hylobadistes Hawaii
New Zealand Swan Cygnus sumnerensis New Zealand
Kaua’I Turtle-jawed Moa-nalo Chelychelynechen quassus Hawaii
Stumbling (Short-billed) Moa-nalo Ptaiochen pau Hawaii
Maui Nui (Large-billed) Moa-nalo Thambetochen chauliodus Hawaii
O’ahu Moa-nalo Thambetochen xanion Hawaii
Lesser Madagascar Sheldgoose Alopochen sirabensis Madagascar
Mauritian Shelduck Alopochen mauritiana Mascarene Islands
Réunion Shelduck Alopochen kervazoi Mascarene Islands

Madagascar Sheldgoose Centrornis majori Madagascar
Scarlett’s Duck Malacorhynchus scarletti New Zealand
Finch’s Duck Chenonetta finschi New Zealand
Chatham Island Duck Anas (Pachyanas) chathamica New Zealand
Mauritian Duck Anas theodori Mascarene Islands
Amsterdam Island Duck Anas marecula Indian Ocean
Labrador Duck Camptorhynchus labradorius North America
Auckland Islands Merganser Mergus australis New Zealand

Chatham Islands Merganser Mergus milleneri New Zealand
New Zealand Blue-billed Duck Oxyura vantetsi New Zealand
New Zealand Musk Duck Biziura delautouri New Zealand
Kaua’I Mole Duck Talpanas lippa Hawaii

Critically Endangered

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

Endangered

Blue Duck Hymenolaimus malacorhynchos
White-winged Duck Asarcornis scutulata
Hawaiian Duck Anas wyvilliana
Meller’s Duck Anas melleri
Madagascar Teal Anas bernieri
Scaly-sided Merganser Mergus squamatus
White-headed Duck Oxyura leucocephala
Maccoa Duck Oxyura maccoa

Vulnerable

Swan Goose Anser cygnoid
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
Marbled Teal Marmaronetta angustirostris
Common Pochard Aythya ferina
Velvet Scoter Melanitta fusca
Steller’s Eider Polysticta stelleri
Long-tailed Duck Clangula hyemalis
Campbell Islands Teal Anas nesiotis

Near Threatened

Northern Screamer Chauna chavaria
Emperor Goose Anser canagicus
Orinoco Goose Oressochen (Neochen) jubata
Falcated Duck Mareca falcata
Sunda Teal Anas gibberifrons
Brown Teal Anas chlorotis
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
Hawaiian Goose Branta sandvicensis
Auckland Island Teal Anas aucklandica
West Indian Whistling-duck Dendrocygna arborea

Least concern (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

SUB-SPECIES

Extinct since human contact

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

Critically Endangered

Niceforo’s Pintail Anas georgica niceforoi
Borrero’s Cinnamon Teal Anas cyanoptera borreroi

Endangered

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

Vulnerable

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

Near Threatened

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

Least concern (only those sub-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)

POPULATIONS

Extinct since human contact

Not evaluated

Critically Endangered

Ruddy-headed Goose Chloephaga rubidiceps Mainland South America

Endangered

None

Vulnerable

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)

Near Threatened

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

Data deficient

Barrow’s Goldeneye Bucephala islandica Greenland/Eastern North America