Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a catfish (Loricariidae) with Cocoi heron (Ardea cocoi) scavenging remnants, Rio Cuiaba, Brazil

Gabriel Rojo / Cocoi heron (Ardea cocoi) standing in tree. Pantanal, Mato Grosso, Brazil.

Bernard Castelein / Amazon kingfisher, (Chloroceryle amazona) female, andwith Cocoi heron (Ardea cocoi) in background, Municipal protected area of Pampas del Yacuma, Bolivia

Bernard Castelein / Cocoi Heron (Ardea cocoi) sunbathing , Pampas del Yacuma Protected Area, Bolivia

Franco Banfi / Cocoi heron (Ardea cocoi) displaying, Pantanal wetlands, Mato Grosso, Brazil

Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a catfish (Loricariidae) with Cocoi heron (Ardea cocoi) scavenging remnants, Rio Cuiaba, Pantanal, Brazil.

Luke Massey / Giant otter (Pteronura brasiliensis) feeding on a catfish (Loricariidae) with Cocoi heron (Ardea cocoi) scavenging remnants, Rio Cuiaba, Pantanal, Brazil.

Luke Massey / Cocoi heron (Ardea cocoi) with Catfish prey (Loricariidae) attacked by Black collared hawk (Busarellus nigricollis) Pantanal, Brazil..

Luke Massey / Cocoi heron (Ardea cocoi) with Catfish (Loraciidae) attacked by a Black collared hawk (Busarellus nigricollis) Pantanal, Brazil..

Luke Massey / Cocoi heron (Ardea cocoi) with Catfish (Loraciidae) Pantanal, Brazil..

Luke Massey / Cocoi heron (Ardea cocoi) reflected in water, Pantanal, Brazil.

Sylvain Cordier / Cocoi heron (Ardea cocoi), fishing, Pantanal, Mato Grosso, Brazil.

John Cancalosi / Crossbedded sandstone, Hawkstone Park, Shropshire, England, UK, September.

Nick Garbutt / Coqoi heron (Ardea cocoi) male on branch overhanging the Cuiaba River, northern Pantanal, Mato Grosso, Brazil.

Murray Cooper / White-necked Heron (Ardea cocoi) on palm, Ecuador

Tony Heald / Cocoi heron (Ardea cocoi) resting portrait, Pantanal, Brazil

Marcos Baumann/ BIA / White-necked Heron (Ardea cocoi) swallowing fish, Santiago, Chile

Suzi Eszterhas / Cocoi heron (Ardea cocoi) fishing, Pantanal, Brazil.

Suzi Eszterhas / Cocoi heron (Ardea cocoi) fishing, Pantanal, Brazil.

Gabriel Rojo / White-necked heron (Ardea cocoi) Ibera Marshes, Corrientes Province, Argentina

Suzi Eszterhas / Jacare Caiman (Caiman yacare), Great Egret (Ardea alba), Limpkin (Aramus guarauna), Jabiru (Jabiru mycteria), Wood Stork (Mycteria americana), Snowy Egret (Egretta thula), White-necked Heron (Ardea co...

Sean Crane / White-necked Heron (Ardea cocoi) perched in a tree, Tuichi River, Pampas, Bolivia

Luiz Claudio Marigo / Cocoi Heron (Ardea cocoi) catching a fish at the Pixaim River, Pantanal of Mato Grosso, Mato Grosso State, Western Brazil.

Luiz Claudio Marigo / Cocoi Heron (Ardea cocoi) catching a fish at the Pixaim River, Pantanal of Mato Grosso, Mato Grosso State, Western Brazil.

Hermann Brehm / Cocoi Heron (Ardea cocoi) feeding on fish, Pantanal, Brazil.

Hermann Brehm / Cocoi Heron (Ardea cocoi) in flight, Pantanal, Brazil.

Hermann Brehm / Cocoi Heron (Ardea cocoi) catching fish, Pantanal, Brazil.

Hermann Brehm / Cocoi Heron (Ardea cocoi) feeding on fish, Pantanal, Brazil.

Hermann Brehm / Cocoi Heron (Ardea cocoi) feeding on fish, Pantanal, Brazil.

Hermann Brehm / Cocoi Heron (Ardea cocoi) stretching wings in trees, Pantanal, Brazil.

Hermann Brehm / Cocoi Heron (Ardea cocoi) feeding on fish, Pantanal, Brazil.

Angelo Gandolfi / Cocoi Heron (Ardea cocoi) with caimans in the background, Pantanal, Brazil

Angelo Gandolfi / Cocoi Heron (Ardea cocoi) at waters edge, Pantanal, Brazil

Glenn Bartley / White-necked Heron (Ardea cocoi), Manu National Park, Peru

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.

Franco Banfi / Cocoi heron (Ardea cocoi) fishing in river, Pantanal wetlands, Mato Grosso, Brazil.

Franco Banfi / Cocoi heron (Ardea cocoi) in flight carrying fish prey in beak, Pantanal wetlands, Mato Grosso, Brazil.

Jeff Vanuga / Cocoi heron (Ardea cocoi) taking flight, backlit by morning sunlight, Cuiaba River, Pantanal region, Brazil.

Jeff Vanuga / Cocoi heron (Ardea cocoi) taking flight from river with Piranha prey in beak, Cuiaba River, Pantanal region, Brazil.

Maxime Aliaga / Cocoi heron (Ardea cocoi) eating Pinecone pleco fish (Pseudorinelepis genibarbis). Pacaya Samiria National Park, Loreto, Peru.

Sylvain Cordier / Cocoi heron (Ardea cocoi), Pantanal, Mato Grosso, Brazil.

Sylvain Cordier / Cocoi heron (Ardea cocoi), with catfish prey, Pantanal, Mato Grosso, Brazil.

Naskrecki & Guyton / Leaf nosed bat (Macronycteris vittatus) in flight, Codzo Caves, Mazamba, Sofala, Mozambique. Controlled conditions