Aggressionism is the philosophical theory that the only real cause of war is human aggressiveness. This theory has dominated much evolutionary thought about human nature. Nonetheless, many evolutionary biologists discount aggressionism as it promotes extinction.
It would be interesting to know that aggression can be noticed in fish due to dominance hierarchies, territoriality, sex, domestication and others. 
- Alexander Moseley (2002). A Philosophy of War. Algora Publishing. p. 78. ISBN 1-892941-94-5.
- Signe Howell; Roy G. Willis (1989). Societies at Peace: Anthropological Perspectives. Taylor & Francis. p. 188. ISBN 0-415-01825-0.
- Charles De Paolo (2003). Human Prehistory in Fiction. McFarland. p. 87. ISBN 0-7864-1417-0.
- Reebs, S. 2008. Aggression in fishes. Howfishbehave.com: p.1-9
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