Members of the Mashco-Piro tribe observe an expedition of the Spanish Geographical Society from across the Alto Madre de Dios river in the Amazon basin of southeastern Peru, as photographed through a telescope by Spanish explorer Diego Cortijo on November 16, 2011, and distributed by Survival International on January 31, 2012. Survival International has the Mashco-Piro tribe listed as one of around 100 uncontacted indigenous tribes in the world.
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