http://en.wikipedia.org/wiki/Two-Spirit
Two-Spirit People (also Two Spirit or Twospirit) is an umbrella term sometimes used for what was once commonly known as berdaches (pron.: /bərˈdæʃɨz/), Indigenous North Americans who fulfill one of many mixed gender roles found traditionally among many Native Americans and Canadian First Nations communities.
Third gender roles historically embodied by Two-Spirit people include performing work and wearing clothing associated with both men and women. The presence of male two-spirits "was a fundamental institution among most tribal peoples."[1] Male and female two-spirits have been "documented in over 130 tribes, in every region of North America."[2]
These individuals were sometimes viewed in certain tribes as having two spirits occupying one body. Their dress is usually a mixture of traditionally male and traditionally female articles. According to Sabine Lang they have distinct gender and social roles in their tribes.[14] In some tribes, male-bodied two-spirits held specific active roles which, varying by tribe, may include:
healers or medicine persons
conveyors of oral traditions and songs (Yuki)
foretellers of the future (Winnebago, Oglala Lakota)
conferrers of lucky names on children or adults (Oglala Lakota, Tohono O'odham)
nurses during war expeditions
potters (Zuni, Navajo, Tohono O'odham)
matchmakers (Cheyenne, Omaha, Oglala Lakota)
makers of feather regalia for dances (Maidu)
special role players in the Sun Dance (Crow, Hidatsa, Oglala Lakota)