An aerial view of the Kamayura tribe in the Xingu National Park, Mato Grosso, Brazil, October 2, 2015. Brazilian firefighters from the Alianaca da Terra, a Civil Society Organization of Public Interest (OSCIP) that was trained by the U.S. Forest Service, are teaching indigenous peoples from 12 tribes in the Xingu National Park to prevent and combat wildfires in the Amazon forest. Picture taken October 2, 2015. REUTERS/Paulo Whitaker