Rod Williams / African yellowbill duck (Anas undulata undulata) captive, occurs in Southern and Eastern Africa.

Eric Baccega / Yellow-billed duck (Anas undulata) pair in the swamps of Mabamba, lake Victoria, Uganda

Richard Du Toit / Yellowbilled duck (Anas undulata) flock, flying in a row, Marievale Bird Sanctuary, Gauteng Province, South Africa. June.

Cheryl-Samantha Owen / Yellow-billed duck (Anas undulata) and chicks on water, Rocherpan National Park, Western Cape, South Africa.

Will Burrard-Lucas / Yellow-billed Ducks (Anas undulata) Bale Mountains National Park, Ethiopia.

Ann & Steve Toon / Yellow billed duck (Anas undulata) portrait, Intaka Island wetland centre, Cape Town, South Africa

Inaki Relanzon / Yellow-billed duck (Anas undulata) on water, Lake Bunyony, Uganda, Africa, July

Tony Heald / Yellow-Billed Duck (Anas undulata) on water. Cape Town, South Africa, January.

Tony Heald / Yellow-Billed Duck (Anas undulata) on water. Cape Town, South Africa, January.

Terry Andrewartha / Yellow billed duck (Anas undulata) on water, Masai Mara NP, Kenya

Richard Du Toit / Yellow billed duck {Anas undulata} Helderberg NR, South Africa

Richard Du Toit / Yellow-billed Duck (Anas undulata) flock flying, Rietvlei Nature Reserve, Gauteng, South Africa

Tui De Roy / Yellow-billed Duck (Anas undulata) showing blue speculum feathers on wing, Lewa Wildlife Conservation Area, Kenya

Suzi Eszterhas / Yellow-billed Duck (Anas undulata), Ngamba Island Chimpanzee Sanctuary, Lake Victoria, Uganda

Vincent Grafhorst / Yellow-billed Duck (Anas undulata) pair flying, Gaborone Game Reserve, Botswana

Vincent Grafhorst / Yellow-billed Duck (Anas undulata) pair flying, Gaborone Game Reserve, Botswana

Mike Read / Yellow billed duck {Anas undulata} Lake Naivasha Kenya

Rob Drummond/ BIA / Yellow-billed Duck (Anas undulata), Uganda