The XO Directory

An uncontacted tribe was recently found in the Amazon jungle in Brazil. Tribe members would fire arrows at airplane whenever they see them. They wear black and red dyes, made from crushed seeds, which experts believed to signal aggression.

"We are very confident the photos are genuine," said Miriam Ross, a spokesperson for Survival International, which estimates that half of the hundred or so uncontacted tribes in the world live in the rain forests of Brazil and Peru.

Due to their vulnerable immune systems, these groups are highly susceptible to diseases borne by outsiders such as missionaries, loggers, or oil workers.

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