The Metyktire is a native people who live on the Menkregnoti reservation in the Amazon
Amazon River
The Amazon of South America is the second longest river in the world and by far the largest by waterflow with an average discharge greater than the next seven largest rivers combined...

 basin. They are estimated to have about 87 members. They were discovered in May 2007 when two tribesmen entered a Kayapo-tribe village in the Menkregnoti reservation. The Metyktire form part of the Kayapo people
Kayapo people
The Kayapo people are the Gê-speaking native peoples of the plain lands of the Mato Grosso and Pará in Brazil, south of the Amazon Basin and along Rio Xingu and its tributaries.In 2003, their population was 7,096....

 and speak an archaic version of the Kayapo language.

When discovered, they had not had any known contact with Western civilization. This was attributed to their location on the 12100000 acres (48,967 km²) reservation, in an area difficult to access due to dense jungle and lack of nearby rivers. The Metyktire are a subgroup of the Kayapo tribe, but had little to no recent contact with them until two members visited a Kayapo village in May 2007. The Kayapo believe the Metyktire formed when several families fled deeper into the jungle in the 1950s.

Neither men nor women wear clothes. Men wear penis
The penis is a biological feature of male animals including both vertebrates and invertebrates...

-protection. The women shave their heads.
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