Jack Dykinga / Gaucho herding horses on the shoreline of Lago Almarga in the morning light, with Torres del Paine mountains in background under stormy skies. Patagonia, Chile.

Angelo Gandolfi / Pantanal cowboy / gaucho (Pantaneiros) driving cattle. Pantanal, Brazil, August 2010.

Kristel Richard / A gaucho (cowboy) tries to remain on the back of a wild horse rearing vertically (Equus caballus) in the rodeo during the Fiesta de la Patria Gaucha, Tacuarembo, Uruguay, April 2008

Hermann Brehm / Gauchos herding cattle on horseback, Pantanal, Brazil.

Jose B. Ruiz / Patagonian Gaucho rider leading another horse, Torres del Paine. Patagonia, Puerto Natales, Chile, April.

Jose B. Ruiz / Horses tethered in snow, Torres del Paine, Patagonia, Puerto Natales, Chile. April.

Jose B. Ruiz / Gaucho with Patagonian flag, Torres del Paine. Patagonia, Puerto Natales, Chile. April 2016.

Gabriel Rojo / Lesser Shrike-Tyrant (Agriornis murinus) La Pampa, Argentina

Chris Mattison / Gauchos and their dogs, Patagonia, Chile, March 2015.

Angelo Gandolfi / Pantanal cowboy/ gaucho (Pantaneiro) Pantanal, Brazil, August 2010.

Ben Lascelles / A 'Gaucho', cowboy of Gran Chaco, Santa Olga, Chaco Province, Argentina. October

John Waters / Gaucho working with sheep in a corral, Province of Corrientes, NE Argentina