Kowboje z Mato Grosso - AFP

In this May 18, 2017 photo, Joao Aquino Pereira, right, talks with fellow cowboy Rene Almeida at dawn in Corumba, Pantanal wetlands, Mato Grosso do Su...

In this May 17, 2017 photo, cowboy Joao Aquino Pereira rides his horse in Corumba, in the Pantanal wetlands of Mato Grosso do Sul state, Brazil. Each...

In this May 18, 2017 photo, cowboy cook Odair Batista crosses the Taquari River with a horse train carrying food for the cowboys in Corumba, in the Pa...

In this May 18, 2017 photo, a marsh deer stands near a herd of oxen in Corumba, in the Pantanal wetlands of Mato Grosso do Sul, state, Brazil. At diff...

In this May 18, 2017 photo, a cowboy prepares his mounts to continue the journey in Corumba, in the Pantanal wetlands of Mato Grosso do Sul state, Bra...

In this May 18, 2017 photo, cowboys guide the herd to the Taquari River, in Corumba, Mato Grosso do Sul state, Brazil. The crossing of the river with...

In this May 18, 2017 photo, Rene de Almeida, who leads a group of cowboys, stands on a farm at dawn in Porto Rolon near the Taquari River in Corumba,...

In this May 17, 2017 photo, cowboy cook Odair Batista carries a case with food in Corumba, the Pantanal wetlands of Mato Grosso do Sul state, Brazil....

In this May 17, 2017 photo, cook Odair Batista prepares a meal for cowboys in Corumba, in the Pantanal wetlands of Mato Grosso do Sul state, Brazil. B...

In this May 17, 2017 photo, cowboy Joao Aquino Pereira, 66, cooks "churrasco," or barbecue, at a ranch in Corumba, in the Pantanal wetlands of Mato Gr...

In this May 17, 2017 photo, cowboy Joao Aquino Pereira smokes at dawn on a ranch in Corumba, in the Pantanal wetlands of Mato Grosso do Sul state, Bra...

In this May 17, 2017 photo, cowboys chat as they eat a "churrasco," or barbecue, at a ranch in Corumba, in the Pantanal wetlands of Mato Grosso do Sul...

In this May 17, 2017 photo, the Milky Way lights up the sky above a ranch where cowboys spend the night during a round up, in Corumba, in the Pantana...

In this May 17, 2017 photo, cowboys prepare their mounts to continue their journey in Corumba, in the Pantanal wetlands of Mato Grosso do Sul state, B...

In this May 17, 2017 photo, a butterfly perches near a cowboy's "Guampa," or a drinking ox horn, in Corumba, in the Pantanal wetlands of Mato Grosso d...

In this May 17, 2017 photo, cowboys guide oxen through a ford of the Taquari River in Corumba, in the Pantanal wetlands of Mato Grosso do Sul state, B...

In this May 17, 2017 photo, a cowboy stands under a tree at dusk on a farm in Corumba, in the Pantanal wetlands of Mato Grosso do Sul state, Brazil. W...

In this May 16, 2017 photo, Araras ,or Macaws, are seen at a ranch in Corumba, in the Pantanal wetlands of Mato Grosso do Sul state, Brazil. At differ...

In this May 16, 2017 photo, cowboy Renan Lopes Nascimento holds his reigns as he arrives to a ranch to spend the night, in Corumba, in the Pantanal we...

In this May 16, 2017 photo, a cowboy serves "Terere," an herbal "mate" beverage, served ice-cold in an ox horn, in Corumba, in the Pantanal wetlands o...

In this May 16, 2017 photo, cowboys drink "Terere," an herbal "mate" beverage served ice-cold in a glass made out of an ox horn in Corumba, in the Pan...

In this May 16, 2017 photo, a handmade whip handle, in the shape of a boot, hangs in a cowboy camp in Corumba, in the Pantanal wetlands of Mato Grosso...

In this May 16, 2017 photo, an "Arara," or Macaw flies low over a ranch in Corumba, in the Pantanal wetlands of Mato Grosso do Sul state, Brazil. At d...