The literature on evolutionary theory tends to address questions of ethnicity from two perspectives: (1) macro, or long–term selection processes associated with basic human preferences for individual or group survival, ethnic identity or kinship affiliations; and (2) intermediate selection mechanisms associated with the fitness and adaptability of specific cultures, religions or belief systems in different regions of the world. Comparatively less time has been spent addressing micro–evolutionary questions about the timing, escalation and duration of ethnic violence — that is, micro or short–term selection processes and fitness mechanisms that account for the escalation and/or duration of ethnic hatreds, violence or war at a particular time.