Daniel Heuclin / Cocoi heron (Ardea cocoi) in flight, River Yapacani, Bolivia.

Daniel Heuclin / Cocoi heron (Ardea cocoi) in flight, River Yapacani, Bolivia.

Daniel Heuclin / Cocoi heron (Ardea cocoi) in flight, River Yapacani, Bolivia.

Daniel Heuclin / Cocoi heron (Ardea cocoi) standing in profile on drift wood, River Yapacani, Bolivia.

Daniel Heuclin / Cocoi heron (Ardea cocoi) in flight, River Yapacani, Bolivia.

Christophe Courteau / Cocoi / White-necked heron (Ardea cocoi) flying over river, Pantanal, Brazil, July

Pete Oxford / White-necked Heron (Ardea cocoi), Rupununi, Guyana

Murray Cooper / White-necked Heron (Ardea cocoi) in wetland, Colombia

Piper Mackay / Cocoi Heron (Ardea cocoi) perching on narrow branch, Pantanal, Brazil.

Suzi Eszterhas / White-necked Heron (Ardea cocoi), Cuiaba River, Pantanal, Brazil

Suzi Eszterhas / White-necked Heron (Ardea cocoi) walking, Cuiaba River, Pantanal, Brazil

Suzi Eszterhas / White-necked Heron (Ardea cocoi), Cuiaba River, Pantanal, Brazil

Luciano Candisani / White-necked Heron (Ardea cocoi) standing in water, Pantanal Ecosystem, Brazil

Luciano Candisani / White-necked Heron (Ardea cocoi) portrait, Pantanal Ecosystem, Brazil

Theo Allofs / White-necked Heron (Ardea cocoi) silhouetted at sunrise, northern Pantanal, Brazil

Pete Oxford / Cocoi Heron {Ardea cocoi} with fish in beak, Pantanal, Brazil.

Pete Oxford / Cocoi Heron {Ardea cocoi} perching in tree, Pantanal, Brazil.

Konrad Wothe / White-necked Heron (Ardea cocoi), Pantanal, Brazil

Staffan Widstrand / Portrait of flying Cocoi heron {Ardea cocoi} Pantanal, Mato Grosso, Brazil.