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

Agustin Esmoris / Red-backed Hawk (Buteo polyosoma), Puerto Madryn, Argentina

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

Murray Cooper / Red-backed Hawk (Buteo polyosoma) flying, Ecuador

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

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

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