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Johnson, D. D. P., Stopka, P., & Knights, S. (2003). Sociology: The puzzle of human cooperation. Nature, 421(6926), 911–2; discussion 912.
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Fenton, B., & Ratcliffe, J. (2004). Animal behaviour: eavesdropping on bats. Nature, 429(6992), 612–613.
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Bouman, I. (1998). The reintroduction of Przewalski horses in the Hustain Nuruu Mountain Forest Steppe Reserve in Mongolia. Mededelingen: Netherlands Commission for International Nature Protection, 32.
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Bell, A. M. (2007). Evolutionary biology: animal personalities (Vol. 447).
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Packer, C. (1977). Reciprocal altruism in Papio anubis. Nature, 265, 441–445.
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Nowak, M. A., & Sigmund, K. (1992). Tit for tat in heterogeneous populations. Nature, 355, 250–253.
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Maynard Smith, J., & Price, G. R. (1973). The Logic of Animal Conflict. Nature, 246, 15–18.
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Hamilton, W. D. (1970). Selfish and Spiteful Behaviour in an Evolutionary Model. Nature, 228, 1218–1220.
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Reeve, H. K. (1992). Queen activation of lazy workers in colonies of the eusocial naked mole-rat. Nature, 358, 147–149.
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Virányi, Z., Range, F., & Huber, L. (2008). Attentiveness toward others and social learning in domestic dogs. In L. S. Röska-hardy, & E. Neumann-held (Eds.), Learning from Animals?: Examining the Nature of Human Uniqueness (pp. 141–154). New York, NY: Psychology Press.
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