Assurini Indians compete in the tug of war event of the fourth edition of the Traditional Indian Games of Para, held on Maruda Beach in Marapanim, September 7, 2014. Native Brazilians from 15 different tribes are participating in the event that features traditional sports and runs through September 10. Picture taken September 7, 2014. REUTERS/Paulo Santos (BRAZIL - Tags: SPORT SOCIETY) 

Members of the Brazilian indigenous ethnic group Assurini compete during a tug-of-war competition at the XII Games of the Indigenous People, in Cuiaba November 14, 2013. Forty eight Brazilian Indigenous tribes will present their cultural rituals and compete in traditional sports such as archery, running with logs and canoeing during the XII Games of Indigenous People which will run until November 16. REUTERS/Paulo Whitaker (BRAZIL - Tags: SPORT SOCIETY) 

A child from the Brazilian indigenous ethnic group Assurini eats a candy during the XII Games of the Indigenous People in Cuiaba November 13, 2013. Forty eight Brazilian Indigenous tribes will present their cultural rituals and compete in traditional sports such as archery, running with logs and canoeing during the XII Games of Indigenous People which will run until November 16. REUTERS/Paulo Whitaker (BRAZIL - Tags: SPORT SOCIETY) 

Members of the Brazilian Assurini indigenous ethnic group compete in a tug-of-war competition during the XII Games of the Indigenous People, in Cuiaba November 12, 2013. Forty eight Brazilian Indigenous tribes will present their cultural rituals and compete in traditional sports such as archery, running with logs and canoeing during the XII Games of Indigenous People which will run until November 16. REUTERS/Paulo Whitaker (BRAZIL - Tags: SPORT SOCIETY) 

Members of Brazil's Assurini nation compete in a tug of war during the Indigenous Nations' Games in Pagagominas, northern Brazil November 3, 2009. Some 600 Brazilian Indians from 29 ethnic groups will compete in sporting events in the tenth edition of the games. REUTERS/Paulo Santos (BRAZIL SOCIETY) 

Members of Brazil's Assurini nation compete in a tug of war during the Indigenous Nations' Games in Pagagominas, northern Brazil November 3, 2009. Some 600 Brazilian Indians from 29 ethnic groups will compete in sporting events in the tenth edition of the games. REUTERS/Paulo Santos (BRAZIL SOCIETY) 

Natives of Brazil's Assurini tribe celebrate their victory during a canoeing competition during the IX Indigenous Nation's Games in Olinda, north-eastern Brazil November 29, 2007. REUTERS/Paulo Whitaker (BRAZIL) 

Natives of Brazil's Assurini tribe celebrate their victory during a canoeing competition during the IX Indigenous Nation's Games in Olinda, north-eastern Brazil November 29, 2007. REUTERS/Paulo Whitaker (BRAZIL) 

Brazilian Indians from the Assurini tribe compete against another tribe during a tug-of-war competition at the IX Indigenous Nations' Games in Olinda, northeastern Brazil, November 26, 2007. REUTERS/Paulo Whitaker (BRAZIL) 

Brazilian Indian women from the Assurini tribe compete against another tribe during a tug-of-war competition at the IX Indigenous Nations' Games in Olinda, northeastern Brazil, November 26, 2007. REUTERS/Paulo Whitaker (BRAZIL) 

A member of Brazil's Assurini nation aims his arrow during the bow-and-arrow competition at the Indigenous Nations' Games in Olinda, north-eastern Brazil November 25, 2007. Some 1000 Indians from 40 ethnic groups will compete in sporting events including tug-of-war, spear throwing, blowgun and soccer from November 25 to December 1. REUTERS/Paulo Whitaker (BRAZIL) 

Natives from the Assurini tribe walk towards the competition venue on the fourth day of the third Traditional Indian Games of Para State taking place in Conceicao do Araguaia in the Brazilian Amazon region August 23, 2006. REUTERS/Paulo Santos (BRAZIL) 

A native from the Assurini do Xingu tribe takes aim during the bow and arrow competition at the III Traditional Indian Games of Para State, taking place in Conceicao do Araguaia in the Brazilian Amazon region, August 20, 2006. REUTERS/Paulo Santos-Interfoto 

Members of Brazil's Assurini do Tocantins tribe, wearing their traditional "Cokar" headgear which are handmade with feathers from macaws, watch the second Indigenous Nations' Games of Para in Altamira, north of Brazil August 18, 2005. 

Members of Brazil's Assurini do Tocantins tribe, wearing their traditional "Cokar" handmade with macaw feathers, gather at the II Indigenous Nations' Games of Para in Altamira, northern Brazil, August 18, 2005. 

A Brazilian Indianextinguishes the torch during the closing ceremony of the second Indigenous Nations' Games of Para in Altamira, Brazil. A Brazilian Indian of the Assurini do Tocantins tribe extinguishes the torch during the closing ceremony of the second Indigenous Nations' Games of Para in Altamira, north of Brazil August 19, 2005. REUTERS/Paulo Whitaker 

Brazilian Indians of the Assurini do Tocantins tribe are silhouetted during the second Indigenous Nations' Games of Para's closing ceremony in Altamira, Brazil. Brazilian Indians of the Assurini do Tocantins tribe are silhouetted against the sky during the second Indigenous Nations' Games of Para's closing ceremony in Altamira, north of Brazil August 19, 2005. REUTERS/Paulo Whitaker 

A tractor widens part of the Assurini road in the heart of the Amazon jungle in the village of Ressaca in the state of Para, northern Brazil, August 18, 2005. [Environmentalists estimate as much as 20 percent of the jungle has already been cut down by ranchers, loggers, farmers and developers. The Amazon is home to up to 30 percent of the planet's animal and plant species.] 

Members of Brazilian Assurini do Tocantins tribe watch the second Indigenous Nations' Games in Altamira, Brazil. Members of Brazil's Assurini do Tocantins tribe, wearing their traditional "Cokar" headgear which are handmade with feathers from macaws, watch the second Indigenous Nations' Games of Para in Altamira, north of Brazil August 18, 2005. REUTERS/Paulo Whitaker 

Members of Brazil's Assurini do Tocantins tribe, wearing their traditional "Cokar" handmade with macaw feathers, gather at the II Indigenous Nations' Games of Para in Altamira, northern Brazil, August 18, 2005. REUTERS/Paulo Whitaker PW/KS 

A tractor widens part of the Assurini road in the heart of the Amazon jungle in the village of Ressaca in the state of Para, northern Brazil, August 18, 2005. Environmentalists estimate as much as 20 percent of the jungle has already been cut down by ranchers, loggers, farmers and developers. The Amazon is home to up to 30 percent of the planet's animal and plant species. REUTERS/Paulo Whitaker PW/KS 

-PHOTO TAKEN 16AUG05- Brazilian Indians of Assurini do Tocantins sing and dance during the II Indigenous Nations' Games of Para, in Altamira, north of Brazil, August 16, 2005. 

-PHOTO TAKEN 16AUG05- Brazilian Indians of Assurini do Tocantins tribe are silhouetted against the sky during the II Indigenous Nations' Games of Para, in Altamira, north of Brazil, August 16, 2005. 

Brazilian Indians of Assurini do Tocantins sing and dance during the II Indigenous Nations' Games of Para in Altamira. Brazilian Indians of Assurini do Tocantins sing and dance during the II Indigenous Nations' Games of Para, in Altamira, north of Brazil, August 16, 2005. REUTERS/Paulo Whitaker 

Brazilian Indians of Assurini do Tocantins sing and dance during the II Indigenous Nations' Games of Para in Altamira. Brazilian Indians of Assurini do Tocantins sing and dance during the II Indigenous Nations' Games of Para, in Altamira, north of Brazil, August 16, 2005. REUTERS/Paulo Whitaker 

Brazilian Indians are silhouetted against the sky during the II Indigenous Nations' Games of Para in Altamira. Brazilian Indians of Assurini do Tocantins tribe are silhouetted against the sky during the II Indigenous Nations' Games of Para, in Altamira, north of Brazil, August 16, 2005. REUTERS/Paulo Whitaker 

Brazilian Indians are silhouetted against the sky during the II Indigenous Nations' Games of Para in Altamira. Brazilian Indians of Assurini do Tocantins tribe are silhouetted against the sky during the II Indigenous Nations' Games of Para, in Altamira, north of Brazil, August 16, 2005. REUTERS/Paulo Whitaker 

Members of the Brazil's Assurini nation perform during the VII Indigenous Nations' Games closing ceremony in Porto Seguro, November 27, 2004. REUTERS/Paulo Whitaker PW