Pete Oxford / Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) juvenile, Podocarpus National Park, Ecuador

Pete Oxford / Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) juvenile, Ecuador

Gabriel Rojo / Black chested buzzard eagle flying {Geranoaetus melanoleucos} Argentina

Tony Heald / Black-chested buzzard-eagle (Geranoaetus melanoleucus) in flight. Bird of Prey Centre, UK. Captive.

Tony Heald / Black-chested buzzard-eagle (Geranoaetus melanoleucus), portrait. Bird of Prey Centre, UK. Captive.

Oscar Dewhurst / Variable hawk (Geranoaetus polyosoma) in flight. Arequipa, Peru. September. Cropped

Oscar Dewhurst / Variable hawk (Geranoaetus polyosoma) perched in a shrub. Cusco, Peru. September. Cropped

Oscar Dewhurst / Variable hawk (Geranoaetus polyosoma) perched in a shrub. Cusco, Peru. September. Cropped

Ingo Arndt / White-throated Caracara (Phalcoboenus albogularis) chasing Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) while flying, Torres del Paine National Park, Patagonia, Chile

Sylvain Cordier / Variable hawk (Buteo polyosoma) male perched on rocks, Pebble Island, Falkland Islands

Sylvain Cordier / Variable hawk (Buteo polyosoma) male perched with wings stretched on rocks, Pebble Island, Falkland Islands

Sylvain Cordier / Variable hawk (Buteo polyosoma), female on the nest, Pebble Island, Falkland Islands

Sylvain Cordier / Variable hawk (Buteo polyosoma) male in flight, Pebble Island, Falkland Islands

Gabriel Rojo / Black-chested Buzzard-eagle (Geranoaetus melanoleucus) juvenile portrait, La Pampa, Argentina

Mike Read / Variable hawk (Buteo polyosoma) perched on part of a fence, Darwin, East Falkland, Falkland Islands November

Hermann Brehm / Black-chested buzzard-eagle (Geranoaetus melanoleucus), perched above lake, Chile. March.

Gabriel Rojo / Black-chested buzzard-eagle (Geranoaetus melanoleucus) feeding on a fence post, La Pampa, Argentina

Gabriel Rojo / Variable hawk (Geranoaetus polyosoma) juvenile landing on branch, La Pampa, Argentina

Gabriel Rojo / Variable hawk (Geranoaetus polyosoma) in flight, La Pampa , Argentina

Ole Jorgen Liodden / Black-chested buzzard-eagle (Geranoaetus melanoleucus) immature, perched on snag, Tierra del Fuego, Argentina

Gabriel Rojo / Variable hawk (Geranoaetus polyosoma) juvenile, Valdes Peninsula, Chubut, Patagonia, Argentina.

Gabriel Rojo / Variable hawk (Geranoaetus polyosoma) juvenile, Valdes Peninsula, Chubut, Patagonia, Argentina.

Gabriel Rojo / Variable hawk (Geranoaetus polyosoma) on nest, Valdes Peninsula, Chubut, Patagonia, Argentina.

Philippe Clement / Black-chested buzzard-eagle (Geranoaetus melanoleucus) portrait, captive. Occurs in South America.

Pete Oxford / Black chested buzzard-eagle (Geranoaetus melanoleucos) captive, Podocarpus National Park, Ecuador

Pete Oxford / Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) juvenile, Podocarpus National Park, Ecuador

Pete Oxford / Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) juvenile, Podocarpus National Park, Ecuador

Pete Oxford / Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) juvenile, Podocarpus National Park, Ecuador

Murray Cooper / Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) flying, Ecuador

JIM CLARE / Black chested buzzard eagle (Geronoaetus melanoleucos) captive, Ecuador.

JIM CLARE / Black chested buzzard eagle (Geronoaetus melanoleucos) captive, Eucador

Luiz Claudio Marigo / Black-chested buzzard-eagle (Geranoaetus melanoleucus) with Common marmoset (Callithrix jacchus) prey in its claws, Caatinga region of Northeastern Bahia State, Northeastern Brazil.

Eric Baccega / Black chested buzzard eagle (Geranoaetus melanoleucus) captive, France - Digitally Modified

Pete Oxford / Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) juvenile, Ecuador

Pete Oxford / Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) juvenile, Ecuador

Eric Baccega / Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) training with falconer, Chateau de la Bourbansais, Bretagne, France

Hermann Brehm / Black chested buzzard eagle {Geranoaetus melanoleucos} with chick at nest, Torres del Paine NP, Chile

Hermann Brehm / Black chested buzzard eagle {Geranoaetus melanoleucos} Torres del Paine NP, Chile

Hermann Brehm / Black chested buzzard eagle {Geranoaetus melanoleucos} Torres del Paine NP, Chile

Hermann Brehm / Black chested buzzard eagle {Geranoaetus melanoleucos} Torres del Paine NP, Chile

Hermann Brehm / Black chested buzzard eagle calling {Geranoaetus melanoleucos} Torres del Paine NP, Chile

Murray Cooper / Black-chested Buzzard-Eagle (Geranoaetus melanoleucus) flying, Ecuador

Gabriel Rojo / Variable hawk (Geranoaetus polyosoma) female, head portrait, Rio Negro Province, Patagonia, Argentina.

Gabriel Rojo / Variable hawk (Geranoaetus polyosoma) female, portrait, Rio Negro Province, Patagonia, Argentina.

Gabriel Rojo / Variable hawk (Geranoaetus polyosoma) female, perched on wooden post, Rio Negro Province, Patagonia, Argentina.