Typically, the Senufo villages are independent of each other, and each has a male secret society called "Poro" with elaborate initiation rituals in a patch of forest they consider as sacred. The initiation rituals involve masks, figurines, and ritual equipment that the Senufo people carve and have perfected. The secrecy has helped the Senufo people to preserve their culture in the times of wars and political pressure. Senufo wear specially-crafted brass jewelry, such as those mimicking wildlife. ""The main function of Poro is to guarantee a good relationship between the living world and the ancestors. Nerejao is an ancestress who is recognized as the true head of the Poro society. Divination, which is governed by the Sandogo society, is also an important part of Senufo religion. Although Sandogo is usually considered a women's society, men who are called to the profession and inherit through the matrilineal line are permitted to become diviners.""