ABSTRACT
There is an astounding similarity to the situation among humans. The clen'lopment of social structures, in which men join in discrete solidarity groups (fraternal interest groups), is regarded as a condition that favours the development of bellicose tendencit's.~'; Otterhein and Otterhein~(i showed in 1965 that in humans, fhlding is most likely to den~lop among exogamous patrilineal groups with patrilocal post-marital residence. This arrangement ensures that closely related males will remain co-resident or live contiguously for life, while ft'males are exchanged among \'arious patrilineages or patricians. Otterhein and Otterbcin characterized these groups as 'fraternal interest groups'.
