Other Ducks

The White-backed Duck (Thalassornis leuconotus) is believed to be more closely related to whistling ducks. It is brown with black bands all over the body and white facial spot at bill base.

The Freckled Duck (Stictonetta naevosa), Pink-eared Duck (Malacorhynchus membranaceus) and Australian Woodduck (Chenonetta jubata) are endemic to Australia; each a distinctive duck.

Freckled Duck (left) with Hardhead (right) at Hasties Swamp, Australia ©Con Foley

Pink-eared Duck at Hasties Swamp, Australia ©Con Foley

Australian Woodduck family in Adelaide, Australia ©Tan KH

Wood Duck (Aix sponsa) and Mandarin Duck (A. galericulata) are both colourful ducks, but the former belongs to the New World and the latter the Old World.

Male Wood Duck in ID, US ©Tan KH

Wood Duck (male left, female right) in ID, US ©Tan KH

There are 3 species of pygmy geese (genus Nettapus):

• African Pygmy Goose (N. auritus) of Africa
• Green Pygmy Goose (N. pulchellus) in Australasia
• Cotton Pygmy Goose (N. coromandelianus) of Asia and Australia

Green Pygmy Geese (left male, right female) in Kakadu, Australia ©Tan KH

Immature male Cotton Pygmy Goose in Singapore ©Tan KH

Immature female Cotton Pygmy Goose in Singapore ©Tan KH

There are 4 species of steamer ducks (genus Tachyeres) and they are found in South America.

• Flying Steamer Duck (T. patachonicus)
• Fuegian Steamer Duck (T. pteneres)
• Falkland Steamer Duck (T. brachypterus)
• Chubut Steamer Duck (T. leucocephalus)

The Comb Duck (Sarkidiornis sylvicola) of South America and the Knob-billed Duck (S. melanotos) of Africa and Asia are sometimes treated as a single species. They have a distinctive comb-like structure on the bill.

Male Knob-billed Duck in Tonle Sap, Cambodia ©Con Foley

Female Knob-billed Duck in South Africa ©Con Foley

The Muscovy Duck (Cairina moschata) of the New World is one of the two ancestors of domestic ducks; the other being the Mallard. It has a distinctive red wattle patch between the eyes and the bill.

Domestic Muscovy Duck in Australia ©Tan KH

The White-winged Duck (Asarcornis scutulata) is very rare duck of Southeast Asia and India.

White-winged Duck in Sumatra, Indonesia ©Tan GC

Hartlaub’s Duck (Pteronetta hartlaubii) is a duck of equatorial Africa. It has a reddish brown body, white upperwing coverts, black head and neck, white forehead and a dark bill with a pale tip.

Reference
http://www.worldbirdnames.org/ioc-lists/master-list-2/