Animal Family

• Sudanese: no two relatives share the same term.
• Eskimo: in addition to distinguishing relatives based upon sex and generation, also distinguishes between lineal relatives and collateral relatives.
• Iroquois: in addition to sex and generation, also distinguishes between siblings of opposite sexes in the parental generation.
• Crow: a matrilineal system with some features of an Iroquois system, but with a "skewing" feature in which generation is "frozen" for some relatives.