do not precisely identify a person. Spanish names used by Savanna Pumé often change throughout childhood and some adults' names also vary during their lifespan. Spanish names are sometimes used when speaking to or about children below the age of approximately 14, primarily because kin terms may not specifically identify particular young people. The Pumé use a Dravidian form of Dakota-Iroquois kinship classification. Marriage By the age of 15, most Savanna and River Pumé girls are married. Boys also marry young, but the early marriage of Pumé girls is particularly important as a demographic indicator of relatively rapid maturation in response to living in an environment with low food availability, high disease exposure, and potentially high risks of mortality. Pumé girls work less than girls in comparable hunter-gatherer populations, allowing them to potentially spend more calories on growth rather than on foraging effort, and thus reach sexual maturity at a younger age. This may lengthen their reproductive lifespan, compensating for their shorter life expectancy and their high infant and later childhood mortality rates. Although early marriage is the general practice for Pumé hunter-gatherers, there is no evidence of coercion of girls to marry or begin sexual relations before they feel ready. Marriage involves no formal ceremony, exchange of goods, or overt negotiations among adults. It simply consists of establishing co-habitation by the couple. There is some influence of parents on choice of marriage partners, but it is a very flexible system. A small percentage of men have more than one wife, who are usually sisters (sororal polygyny). Among both Savanna and River Pumé, infidelity is uncommon and is cause for divorce. Compared with many lowland South American indigenous groups, the Pumé have low rates of infidelity and divorce among both men and women. Religion and medicine The Pumé engage in frequent all-night dances called tohé for religious and social purposes. These 11-hour dances are held 3-4 nights a week throughout the year. Among the Savanna Pumé, all members of the camp are present in the plaza area of camp for these dances. Smaller River Pumé communities also hold village wide-dances, but larger River communities often have separate dances attended by extended families that represent only a segment of the larger group. The tohé dance involves verse and response singing during the entire night, and increased frequency and speed of circulation around a central pole erected each dance night in the