Pete Oxford / Two White faced whistling ducks {Dendrocygna viduata}, Madagascar.

Murray Cooper / Black-bellied Whistling Duck (Dendrocygna autumnalis) and White-faced Whistling-Duck (Dendrocygna viduata) flock in wetland, Colombia

Gabriel Rojo / White-faced whistling ducks (Dendrocygna viduata), La Pampa, Argentina

Eric Baccega / Nile crocodile (Crocodylus niloticus) resting with flock of white-faced whistling duck around (Dendrocygna viduata). Moremi National Park, Okavango delta, Botswana, Southern Africa

Philippe Clement / White-faced whistling duck (Dendrocygna viduata) swimming in pond, native to Africa and South America. Captive.

Gabriel Rojo / White-faced whistling duck (Dendrocygna viduata) group of three, La Pampa, Argentina.

Wim van den Heever / White-faced duck (Dendrocygna viduata) with reflection at edge of water, Zimanga Private Game Reserve, South Africa.

Bruno D'Amicis / White-faced whistling ducks (Dendrocygna viduata) swimming in wetlands, Jimba, Bahir Dar. Lake Tana Biosphere Reserve. Ethiopia

Denis-Huot / Nile crocodiles (Crocodylus niloticus) and White-faced whistling-ducks (Dendrocygna viduata) at edge of water, Mara river, Masai-Mara game reserve, Kenya.

Christophe Courteau / Roseate Spoonbill (Ajaia ajaia) and White-faced Whistling Duck (Dendrocygna viduata) taking off the shallow water of Hato El Cedral, Llanos, Venezuela.

Christophe Courteau / Mixed flock of White-faced Whistling Duck (Dendrocygna viduata), Black-bellied Whistling-duck (Dendrocygna autumnalis) and Roseate Spoonbill (Ajaia ajaia) taking off the shallow water of Hato El Cedra...

Christophe Courteau / Mixed flock of White-faced Whistling Duck (Dendrocygna viduata), Black-bellied Whistling-duck (Dendrocygna autumnalis), Black-necked Stilts (Himantopus mexicanus) taking off the shallow water of Hato...

E.J. Peiker / White-faced Whistling-Duck (Dendrocygna viduata), Arizona

Rod Williams / White-faced Tree / Whistling Ducks (Dendrocygna viduata). Endemic to Tropical America, Sub-Saharan Africa, Madagascar. Captive.

Rod Williams / White-faced whistling / tree duck (Dendrocygna viduata) two standing amongst grass, Tropical America, Sub-Saharan Africa, Madagascar. Captive.

Edwin Giesbers / White-faced whistling duck (Dendrocygna viduata) on water, captive

Edwin Giesbers / White-faced whistling duck (Dendrocygna viduata) portrait, captive

Anup Shah / White faced whistling ducks (Dendrocygna viduata) preening, Masai Mara National Reserve, Kenya

Anup Shah / White-faced whistling duck (Dendrocygna viduata) Masai Mara National Reserve, Kenya

Anup Shah / White faced whistling ducks (Dendrocygna viduata) group resting at river edge, Masai Mara National Reserve, Kenya

Anup Shah / White faced whistling ducks (Dendrocygna viduata) preening each other, Masai Mara National Reserve, Kenya

Pete Oxford / Mixed flock of whistling ducks and ibis taking flight. White-faced Whistling Duck (Dendrocygna viduata), Black-bellied Whistling-duck (Dendrocygna autumnalis), Scarlet Ibis (Eudocimus ruber). Hato Ma...

Anup Shah / White-faced Whistling-Ducks (Dendrocygna viduata) wading at the edge of the river - wide angle perspective, Masai Mara National Reserve, Kenya. September

Mark Carwardine / White-faced whistling duck (Dendrocygna viduata) portrait, Slimbridge, Gloucestershire, UK, Captive, native to tropical America and Africa

Mark Carwardine / White-faced whistling duck (Dendrocygna viduata) portrait, Slimbridge, Gloucestershire, UK, Captive , native of tropical America and Africa

Anup Shah / White-faced whistling ducks (Dendrocygna viduata) drinking from the river, Masai Mara National Reserve, Kenya. February

Anup Shah / White-faced whistling duck (Dendrocygna viduata)preening primary wing feathers, Masai Mara National Reserve, Kenya. February

Anup Shah / White-faced whistling duck (Dendrocygna viduata)preening tail feathers, Masai Mara National Reserve, Kenya. February

Pete Oxford / White-faced Whistling-Duck (Dendrocygna viduata) flock taking flight, Karanambu Lodge, Rupununi, Guyana

Pete Oxford / White-faced Whistling Duck (Dendrocygna viduata) Slimbridge Wildfowl and Wetlands Trust SW England, UK. captive

Pete Oxford / Small flock of White-faced Whistling ducks (Dendrocygna viduata) Pantanal, Mato Grosso do Sul Province. Brazil. South America.

Richard Du Toit / White-faced Whistling-Duck (Dendrocygna viduata) group in pond, Moremi Game Reserve, Botswana

Nick Garbutt / Flock of White-faced Whistling Duck (Dendrocygna viduata) Okavango Delta, Botswana.

Pete Oxford / White-faced Whistling-Duck (Dendrocygna viduata) portrait, Slimbridge Wildfowl and Wetlands Trust, England

Pete Oxford / White-faced Whistling-Duck (Dendrocygna viduata) bathing, Slimbridge Wildfowl and Wetlands Trust, England

Pete Oxford / White-faced Whistling-Duck (Dendrocygna viduata) flock, Pantanal, Brazil

Michael Hutchinson / White-faced Whistling Duck / White-faced tree duck (Dendrocygna viduata), head portrait, captive, Slimbridge, UK

Michael Hutchinson / White-faced Whistling Duck / White-faced tree duck (Dendrocygna viduata), close-up abstract of wing and belly feathers, captive, Slimbridge, UK

Michael Hutchinson / White-faced Whistling Duck / White-faced tree duck (Dendrocygna viduata), close-up abstract of wing and belly feathers, captive, Slimbridge, UK

Michael Hutchinson / Pair of White-faced Whistling Ducks / White-faced Tree Ducks (Dendrocygna viduata) resting, captive, Slimbridge WWT, UK

Michael Hutchinson / Head of White-faced Whistling Duck / White-faced Tree Duck (Dendrocygna viduata) tucked into feathers, resting, captive, Slimbridge, UK

Pete Oxford / Marabou Stork (Leptoptilos crumeniferus) amid White-faced Whistling-Duck (Dendrocygna viduata) flock, Africa

Rod Williams / White faced whistling duck {Dendrocygna viduata} captive

Michael Hutchinson / White-faced Whistling Duck / White-faced tree duck {Dendrocygna viduata} bathing, captive, Slimbridge WWT, UK

Michael Hutchinson / White-faced Whistling Duck / White-faced tree duck {Dendrocygna viduata} bathing, captive, Slimbridge WWT, UK

Andrew Parkinson / White faced whistling ducks {Dendrocygna viduata} Khwai river, Moremi GR, Botswana

Gabriel Rojo / White faced whistling duck {Dendrocygna viduata} Macachin, La Pampa, Argentina

Richard Du Toit / White faced whistling ducks (Dendrocygna viduata). Moremi reserve, Botswana, Southern Africa

Richard Du Toit / White faced whistling ducks (Dendrocygna viduata). Moremi reserve, Botswana, Southern Africa

Pete Oxford / White faced whistling duck, Lamandraka, Madagascar

Pete Oxford / White faced whistling ducks (Dendrocygna viduata) landing on beach. Panhandle, Okavango Delta, Botswana, Southern Africa

Murray Cooper / White-faced Whistling-Duck (Dendrocygna viduata) flock, South America

Murray Cooper / Roseate Spoonbill (Platalea ajaja), Black-bellied Whistling Duck (Dendrocygna autumnalis), and White-faced Whistling-Duck (Dendrocygna viduata) flock flying, Colombia

Murray Cooper / Black-bellied Whistling Duck (Dendrocygna autumnalis) and White-faced Whistling-Duck (Dendrocygna viduata) flock flying, Colombia

Pete Oxford / White faced whistling duck {Dendrocygna viduata} on ground nest, Madagascar

Bernard Castelein / Flock of White-faced whistling ducks (Dendrocygna viduata) in flight at sunset, Allahein River, The Gambia.

Bernard Castelein / White-faced whistling duck (Dendrocygna viduata) landing on river, Allahein River, The Gambia.

Steve Gettle / White-faced Whistling-Duck (Dendrocygna viduata) pair, Amboseli National Park, Kenya

Steve Gettle / White-faced Whistling-Duck (Dendrocygna viduata), Amboseli National Park, Kenya

Eric Baccega / Martial eagle (Polemaetus bellicosus) perched on branch clutching its prey, a White-faced whistling duck (Dendrocygna viduata), Okavango Delta, Botswana, Africa.

Eric Baccega / Martial eagle (Polemaetus bellicosus) perched on branch clutching its prey, a White-faced whistling duck (Dendrocygna viduata), Okavango Delta, Botswana, Africa.

Bernard Castelein / White-faced whistling duck (Dendrocygna viduata) standing in shallow water, Allahein River, The Gambia.

Bernard Castelein / White-faced whistling duck (Dendrocygna viduata) standing in shallow water, Allahein River, The Gambia.