Rolf Nussbaumer / Pair of Black belled whistling ducks {Dendrocygna autumnalis} Texas, USA

Rolf Nussbaumer / Black belled whistling ducks in flight {Dendrocygna autumnalis} Texas, USA.

George Sanker / Black bellied whistling ducks (Dendrocygna autumnalis) group amongst aquatic vegetation, Hillsborough River, Florida, USA, April

Marie Read / Four Black-bellied whistling-ducks (Dendrocygna autumnalis) perched on a partially-submerged branch in water, Edinburg Wetlands, Edinburg, Texas, USA, March

Barry Mansell / Portrait of a Black-bellied Whistling-Duck (Dendrocygna autumnalis). Everglades National Park, South Florida, USA.

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...

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

Martin Gabriel / Black bellied whistling ducks (Dendrocygna autumnalis) in shallow water, Palo Verde National Park, Costa Rica

Martin Gabriel / Black bellied whistling ducks (Dendrocygna autumnalis) Palo Verde National Park, Costa Rica

Shattil & Rozinski / Black-bellied whistling ducks (Dendrocygna autumnalis) on wooden railing, Nature Conservancy's Southmost Preserve, Lower Rio Grande Valley, USA

Shattil & Rozinski / Black-bellied whistling ducks (Dendrocygna autumnalis) in flight, The Nature Conservancy's Southmost Preserve, Lower Rio Grande Valley wildlife corridor, Texas, USA

Shattil & Rozinski / Black-bellied whistling duck (Dendrocygna autumnalis) flying, Nature Conservancy Southmost Preserve, Lower Rio Grande Valley wildlife corridor, Texas, USA

Tom Vezo / Black-bellied Whistling Duck (Dendrocygna autumnalis), Rio Grande Valley, Texas

Rolf Nussbaumer / A pair of Black-bellied Whistling-Ducks (Dendrocygna autumnalis) Lake Corpus Christi, Texas, USA, April 2003

Rolf Nussbaumer / Female Black-bellied Whistling-Duck (Dendrocygna autumnalis) with ducklings, Lake Corpus Christi, Texas, USA. June 2003

Rod Williams / Black bellied whistling duck {Dendrocygna autumnalis} male, captive, from Central and South America

Tom Vezo / Black bellied whistling duck {Dendrocygna autumnalis} resting amongst water vegetation, Texas, USA.

Tom Vezo / Black bellied whistling duck {Dendrocygna autumnalis} in flight, Texas, USA

Tom Vezo / Two Black bellied whistling duck {Dendrocygna autumnalis} standing in water, Texas, USA

Patricio Robles Gil / Black bellied whistling ducks {Dendrocygna autumnalis} Tamaulipas, Mexico

Patricio Robles Gil / Black bellied whistling ducks {Dendrocygna autumnalis} Tamaulipas, Mexico

Rolf Nussbaumer / Black bellied whistling duck {Dendrocygna autumnalis} profile, Welder Wildlife Refuge, Sinton, Texas, USA.

Rolf Nussbaumer / Black bellied whistling duck {Dendrocygna autumnalis} rear-view, Welder Wildlife Refuge, Sinton, Texas, USA.

Rolf Nussbaumer / Black bellied whistling duck {Dendrocygna autumnalis} adult preening, Welder Wildlife Refuge, Sinton, Texas, USA.

Rolf Nussbaumer / Black bellied whistling duck {Dendrocygna autumnalis} spreading wings, Welder Wildlife Refuge, Sinton, Texas, USA.

Tom Vezo / Black bellied whistling duck pair {Dendrocygna autumnalis} Texas, USA

Tom Vezo / Black bellied whistling duck pair at nestbox {Dendrocygna autumnalis} Texas, USA

Tom Vezo / Black-bellied Whistling Duck (Dendrocygna autumnalis) pair wading, Rio Grand Valley, Texas

Tom Vezo / Black-bellied Whistling Duck (Dendrocygna autumnalis) calling from perch, Brazos Bend, Texas

Tom Vezo / Black bellied whistling duck pair with chicks {Dendrocygna autumnalis} Arizona, USA

Nigel Bean / Black-bellied Whistling ducks at Pierre Wildfowl Trust, Trinidad.

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

Robin Chittenden / Seven Black-bellied whistling-ducks (Dendrocygna autumnalis) in flight, Costa Rica, March

Robin Chittenden / Seven Black bellied whistling ducks (Dendrocygna autumnalis) in flight, Costa Rica, March