An indigenous person of the Bolivian ethnic group Ayoreo walks while carrying arrows during Bolivia's President and current presidential candidate for the Movement for Socialism (MAS) party Evo Morales' closing campaign rally, in Santa Cruz, Bolivia October 15, 2019. REUTERS/David Mercado 

An Ayoreo Indian stands on parched ground in the Chaco region of northwest Paraguay, in Filadelfia November 19, 2009. Drought in the Paraguayan Chaco has killed thousands of livestock and caused a steep decline in milk production, according to government sources and private producers. REUTERS/Jorge Adorno (PARAGUAY SOCIETY ENVIRONMENT DISASTER) 

Ayoreo Indians stand on parched ground in the Chaco region of northwest Paraguay, in Filadelfia November 19, 2009. Drought in the Paraguayan Chaco has killed thousands of livestock and caused a steep decline in milk production, according to government sources and private producers. REUTERS/Jorge Adorno (PARAGUAY DISASTER ENVIRONMENT SOCIETY) 

Ayoreo Indians draw water from a well in the Chaco region of northwest Paraguay, in Filadelfia November 19, 2009. Drought in the Paraguayan Chaco has killed thousands of livestock and caused a steep decline in milk production, according to government sources and private producers. REUTERS/Jorge Adorno (PARAGUAY DISASTER ENVIRONMENT SOCIETY) 

A Bolivian indigenous woman from the "Ayoreos" ethnic group rests in Santa Cruz, some 900 kilometers (560 miles) east of La Paz, December 7, 2006. Some 50 indigenous people arrived in Santa Cruz to protest against changes in the voting rules that President Evo Morales is trying to have approved for the Constituent Assembly. REUTERS/Carlos Hugo Vaca (BOLIVIA) 

A Bolivian indigenous boy from the "Ayoreos" ethnic group rests in Santa Cruz, some 900 kilometers (560 miles) east of La Paz, December 7, 2006. Some 50 indigenous people arrived in Santa Cruz to protest against changes in the voting rules that President Evo Morales is trying to have approved for the Constituent Assembly. The banner reads "Ayoreos, proud of our land, not to subjugation". REUTERS/Str