The Wanano Indians of the northwest Amazon have a social system that differs from those of most tropical forest tribes. Neither stratified by wealth nor strictly egalitarian, Wanano society is "ranked" according to rigidly bound descent groups. In this pioneering ethnographic study, Janet M. Chernela decodes the structure of Wanano society.

In Wanano culture, children can be "grandparents," while elders can be "grandchildren." This apparent contradiction springs from the fact that descent from ranked ancestors, rather than age or accumulated wealth, determines one's standing in...