1. aggression
   1. 1. general issues
   2. 2. functions
      1. maintain fitness of individuals
         1. competition for mates, territory, resources, leadership
         2. protection of self, offspring
         3. dispersal of individuals (outbreeding)
         4. fear of strangers (xenophobia -Goodall)
         5. increase social bonds (deWaal)
      2. other
         1. hunting
         2. infantcide
   3. 3. controls
      1. dominance hierarchies
      2. coalitions
      3. reconciliation behaviors
         1. grooming, submissive expressions, etc.
      4. use of sex to reduce tension
      5. use of foodsharing
   4. 4. situations
      1. diminished resources
      2. artificial feeding
      3. restricted enclosures
   5. 5. gender differences
      1. male aggression may be more ritualistic (intragroup)
      2. females fights may be prolonged, dangerous
   6. 6. biology