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Supertopics:
Natural Selection

Group Selection

Documents:
chimps kill to win new territory
webEwen CallawayNew Scientist2010-06-23
chimps wage war to annex territory
webNicholas WadeNew York Times2010-06-21
chimpanzee aggression leads to territorial expansion
webJohn C. Mitani, David P. Watts...Current Biology2010-06-22