The document provides information on the Amazonia and Orinoco tribal peoples of South America, focusing on the Yanomamö tribe of southern Venezuela. It describes their subsistence activities like cultivating manioc gardens using slash-and-burn techniques. The Yanomamö live in circular thatch houses called shabonos arranged in kin-based groups. They have a patrilineal kinship system where descent is traced only through the male line. Their society is divided into two moieties based on the marriage of cross-cousins. Feasts are held by the Yanomamö to create alliances but can also result in violence between groups. They use hallucinogenic drugs and shaman