Michael Hutchinson / Whistling Heron (Syrigma sibilatrix) on marsh, Esteros del Ibera, Argentina

Michael Hutchinson / Whistling Heron (Syrigma sibilatrix) foraging on marsh, Esteros del Ibera, Argentina

Kevin Schafer / Whistling Heron (Syrigma sibilatrix) in tall grass, Pantanal, Brazil

Gabriel Rojo / Whistling heron calling {Syrigma sibilatrix} Argentina

Tui De Roy / Whistling Heron (Syrigma sibilatrix) foraging in savannah marshland, Caiman Ecological Refuge, Pantanal, Brazil

Theo Allofs / Whistling Heron (Syrigma sibilatrix), southern Pantanal, Brazil

Gabriel Rojo / Whistling heron {Syrigma sibilatrix} La Pampa, Argentina Macachin, Pampas