 The Kwoma will speak in their own language to these outsiders, who will respond in their own language, so that intertribal communication relies upon understanding other languages, not speaking them.Relations with outsiders are often hostile, and even relations among the four Kwoma subtribes can be violent, with members of one subtribe setting out on head-hunting expeditions against another.Each subtribe consists of several hamlets, containing households with hereditary property rights in the hamlet's land.