Ethan has documented 66 out of 174 members of the family Anatidae.
Hymenolaimus malacorhynchos (Blue Duck)
Spatula clypeata (Northern Shoveler)
Spatula rhynchotis (Australasian Shoveler)
Malacorhynchus membranaceus (Pink-Eared Duck)
Mareca americana (American Widgeon)
Mareca penelope (Eurasian Widgeon)
Recorded just south of Lake Mokoto, Hokkaido.
Bucephala albeola (Bufflehead)
Anas platyrhynchos (Mallard)
Anas superciliosa (Pacific Black Duck)
Aix sponsa (Wood Duck)
Aix galericulata (Mandarin Duck)
Asarcornis scutulata (White-Winged Duck)
Anas carolinensis (Green-Winged Teal)
Spatula discors (Blue-Winged Teal)
Spatula querquedula (Garganey)
Aythya americana (Redhead)
Aythya valisineria (Canvasback)
Aythya australis (Hardhead)
Aythya collaris (Ring-Necked Duck)
Aythya affinis (Lesser Scaup)
Aythya novaeseelandiae (New Zealand Scaup)
Anas acuta (Northern Pintail)
Spatula cyanoptera (Cinnamon Teal)
Anas gibberifrons (Sunda Teal)
Anas castanea (Chestnut Teal)
Anas chlorotis (Brown Teal)
Anas luzonica (Philippine Duck)
Stictonetta naevosa (Freckled Duck)
Chenonetta jubata (Maned Duck)
Tadorna tadorna (Common Shelduck)
Tadorna tadornoides (Australian Shelduck)
Tadorna variegata (Paradise Shelduck)
Tadorna ferruginea (Ruddy Shelduck)
Radjah radjah (Radjah Shelduck)
Aythya nyroca (Ferruginous Duck)
Netta rufina (Red-Crested Pochard)
Nettapus coromandelianus (Cotton Pygmy-Goose)
Cereopsis novaehollandiae (Cape Barren Goose)
Anser indicus (Bar-Headed Goose)
Branta canadensis (Canada Goose)
Branta hutchinsii (Cackling Goose)
Anser anser (Graylag Goose)
Anser albifrons (Greater White-Fronted Goose)
Branta bernicla (Brant)
Anser caerulescens (Snow Goose)
Dendrocygna arcuata (Wandering Whistling-Duck)
Dendrocygna autumnalis (Black-Bellied Whistling-Duck)
Dendrocygna javanica (Lesser Whistling-Duck)
Dendrocygna eytoni (Plumed Whistling Duck)
Mareca strepera (Gadwall)
Oxyura leucocephala (White-Headed Duck)
Oxyura jamaicensis (Ruddy Duck)
Oxyura australis (Blue-Billed Duck)
Biziura lobata (Musk Duck)
Bucephala clangula (Common Goldeneye)
Bucephala islandica (Barrow’s Goldeneye)
Anas poecilorhyncha (Indian Spot-Billed Duck)
Anas zonorhyncha (Eastern Spot-Billed Duck)
Mergus merganser (Common Merganser)
Lophodytes cucullatus (Hooded Merganser)
Mergus serrator (Red-Breasted Merganser)
Cygnus atratus (Black Swan)
Cygnus columbianus (Tundra Swan)
Cygnus olor (Mute Swan)
Somateria mollissima (Common Eider)
Melanitta perspicillata (Surf Scoter)