Ben Lascelles / Southern Screamer (Chauna torquata). In flight. Esteros de Ibera / Ibera Wetlands Provincial Park, Argentina. October

Ben Lascelles / Southern Screamer (Chauna torquata). In flight, 'screaming'. Esteros de Ibera / Ibera Wetlands Provincial Park, Argentina. October

Ben Lascelles / Southern Screamer (Chauna torquata) in flight. Esteros de Ibera / Ibera Wetlands Provincial Park, Argentina. October

Ben Lascelles / Southern / Crested Screamer (Chauna torquata) parental pair with chicks at nest. Ibera Wetlands Provincial Park, Argentina, October.

Edwin Giesbers / Southern / Crested screamer (Chauna torquata) portrait, captive

Edwin Giesbers / Southern / Crested screamer (Chauna torquata) close up of feathers, captive

Edwin Giesbers / Southern / Crested screamer (Chauna torquata) head portrait, captive

Luiz Claudio Marigo / A pair of Southern / Crested Screamer (Chauna torquata) walking through grass. The Pantanal wetlands of Mato Grosso State, Brazil, October.

Luiz Claudio Marigo / Southern / Crested Screamer (Chauna torquata) walking across grass. The Pantanal wetlands of Mato Grosso State, Brazil, October.

Mary McDonald / Southern Screamer (Chauna torquata) portrait, standing, Brazil, Pantanal, August

Murray Cooper / Northern Screamer (Chauna chavaria), Colombia

Murray Cooper / Horned Screamer (Anhima cornuta), Ecuador

Murray Cooper / Horned Screamer (Anhima cornuta), Ecuador

Dave Watts / Crested screamer (Chauna torquata) pair screaming, captive, from Peru

Dave Watts / Crested screamer (Chauna torquata) beside water, captive, from Peru

Mark Bowler / Horned screamer (Anhima cornuta) screaming, Peru

Mark Bowler / Horned screamer (Anhima cornuta) Peru

Michael Hutchinson / Southern / Crested screamer (Chauna torquata) calling in marshes, Esteros del Ibera, Argentina

Michael Hutchinson / Southern / Crested screamers (Chauna torquata) pair on marsh, Esteros del Ibera, Argentina

David Kjaer / Crested Screamer (Chauna torquata) Captive, UK, native to the marshlands, grasslands and lagoons of South America

Rod Williams / Crested screamers {Chauna torquata} captive, from South America

Luiz Claudio Marigo / Crested / Southern screamer standing on one leg {Chauna torquata} South America

Pete Oxford / Southern / Crested screamer chick {Chauna torquata} Cerrado, Piaui, Brazil

Rod Williams / Crested screamer {Chauna torquata} captive, from South America

Hermann Brehm / Crested / Southern screamer {Chauna torquata} Pantanal, Brazil

Hermann Brehm / Crested / Southern screamer stretching leg {Chauna torquata} Pantanal, Brazil

Gabriel Rojo / Crested (southern) screamer, pair 'screaming' + chick {Chauna torquata} Argentina

Gabriel Rojo / Crested (southern) screamer + chick {Chauna torquata} Argentina

Gabriel Rojo / Crested (southern) screamer, pair caring for chick {Chauna torquata} + Rail, Argentina

Pete Oxford / Crested screamer {Chauna torquata} Pantanal Brazil