A Yawalapiti boy dips his head into the Xingu River in the Xingu National Park, Mato Grosso State, May 9, 2012. In August the Yawalapiti tribe will hold the Quarup, which is a ritual held over several days to honour in death a person of great importance to them. This year the Quarup will be honouring two people - a Yawalapiti Indian who they consider a great leader, and Darcy Ribeiro, a well-known author, anthropologist and politician known for focusing on the relationship between native peoples and education in Brazil.[Photo/Agencies]