[augrosStanciu1992] Augros, R. and G. Stanciu. 1992. Competition and the Enculturation of Science. In Allan Combs (ed). Cooperation: Beyond the Age of Competition. Philadelphia: Gordon and Breach, 126-135.

[burling2000] Burling, Robbins. 2000. Comprehension, Production and Conventionalisation in the Origins of Language. In C. Knight, M. Studdert-Kennedy and J.R. Hurford (eds). The Evolutionary Emergence of Language. Cambridge: CUP, 27-39.

[burton1978] Burton, Maurice. 1978. Just Like and Animal. London: Dent.

[carrollLoye1992] Carroll, S. P. and J. E. Loye. 1992. Natural Selection, Competition and Cooperation: Human Biology and Human Freedom. In Allan Combs (ed). Cooperation: Beyond the Age of Competition. Philadelphia: Gordon and Breach, 136-146.

[colinvaux1978] Colinvaux, Paul. 1978. Why Big Fierce Animals Are Rare: An Ecologist's Perspective. Princeton: Princeton University Press.

[colinvaux1980] Colinvaux, Paul. 1980. Why Big Fierce Animals Are Rare. Harmondsworth: Penguin Books.

[darwin1988] Darwin, Charles. 1988[1859]. On the Origin of Species. New York: NYU Press. Page references are from this edition.

[dawkins1976] Dawkins, Richard. 1976. The Selfish Gene. Oxford: OUP.

[dessalles2000ant3] Dessalles, J.-L. 2000. Language and Hominid Politics. In C. Knight, M. Studdert-Kennedy and J.R. Hurford (eds). The Evolutionary Emergence of Language. Cambridge: CUP, 62-80.

[HSK1998ant3] Hurford, J.R., M. Studdert-Kennedy and C. Knight (eds). 1998. Approaches to the Evolution of Language. Cambridge: CUP.

[inouye1984] Inouye, D. W. 1984. The Ant and the Sunflower. Natural History 93:49-52.

[knight2000a] Knight, 2000a. Introduction. In C. Knight, M. Studdert-Kennedy and J.R. Hurford (eds). The Evolutionary Emergence of Language. Cambridge: CUP, 19-26.

[knight2000b] Knight, 2000b. Play as Precursor of Phonology and Syntax. In C. Knight, M. Studdert-Kennedy and J.R. Hurford (eds). The Evolutionary Emergence of Language. Cambridge: CUP, 99-119.

[KSH2000ant3] Knight, C., M. Studdert-Kennedy and J.R. Hurford (eds). 2000. The Evolutionary Emergence of Language. Cambridge: CUP.

[krebsDawkins1984] Krebs, J.R. & Dawkins, R. 1984. Animal signals: Mind-reading and manipulation. In: Behavioural ecology. An evolutionary approach. (Ed. by J.R. Krebs & N.B. Davies), pp. 380-402. Sunderland, Massachusetts: Sinauer Associates Inc.

[kropotkin1914] Kropotkin, P. A. 1914[1902]. Mutual Aid: A factor of evolution. Boston: Extending Horizons Books.

[limbaugh1961] Limbaugh, Conrad. 1961. Cleaning Symbiosis. Scientific American 205:42-49.

[lorenz1963] Lorenz, K. 1963. On Aggression. New York: Harcourt, Brace and World.

[lovelock1979] Lovelock, J. E.. 1979. Gaia, a new look at life on earth. Oxford: OUP.

[mitani1994] Mitani, John. 1994. Ethological Studies of Chimpanzee Vocal Behavior. In Wrangham et al. (eds). Chimpanzee Cultures. Cambridge, MA: Harvard University Press.

[noble2000] Noble, Jason. 2000. Cooperation, Competition and the Evolution of Prelinguistic Communication. In C. Knight, M. Studdert-Kennedy and J.R. Hurford (eds). The Evolutionary Emergence of Language. Cambridge: CUP, 40-61.

[power2000ant3] Power, Camilla. 2000. Secret Language Use at Female Initiation: Bounding Gossiping Communities. In C. Knight, M. Studdert-Kennedy and J.R. Hurford (eds). The Evolutionary Emergence of Language. Cambridge: CUP, 81-98.

[saganMargulis1992] Sagan, D. and L. Margulis. 1992. Bacterial Bedfellows. In Allan Combs (ed). Cooperation: Beyond the Age of Competition. Philadelphia: Gordon and Breach, 121-125.

[sahlins1976] Sahlins, Marshall. 1976. The Use and Abuse of Biology. Ann Arbor: University of Michigan Press.

[savage-rubaughLewin1994] Savage-Rumbaugh, E. S. and R. Lewin. 1994. Kanzi: the Ape at the Brink of the Human Mind. New York: Wiley.

[schwartz1986] Schwartz, Barry. 1986. The Battle for Human Nature. NY and London: W.W. Norton & Co.

[wilkinson1984] Wilkinson, G. S. 1984. Reciprocal food sharing in the vampire bat. Nature. 308:181-184.

[wray2000] Wray, Alison (ed). 2002. The Transition to Language. Oxford: OUP.