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Figure 2 Frisby, J. P. (1980) Seeing, Illusion, Brain and Mind, Oxford University Press;
Figure 3 Bradbury, J. W. and Vehrencamp, S.L. (1998) Principles of Animal Communication, Sinauer Associates, Inc.;
Figure 4 & 10 (bottom) Gould, J. L. and Gould, C. G. (1999) The Animal Mind, Scientific American Inc.;
Figure 6 Gillespie, T. R. and Chapman, C. A. (2001) Determinants of group size in the red colobus monkey (Procolobus badus): an evaluation of the generality of the ecological-constraints model, Behavioural Ecology and Sociobiology, vol. 50, no. 4, p. 333, fig. 1A-F, copyright Springer-Verlag 2001;
Figure 9 Macdonald, D. (ed.) (2001), The New Encyclopedia of Mammals, Oxford University Press;
Figure 10 (top) Sourced from http://serendip.brynmawr.edu;
Figure 11 Dunbar, R. I. M. (1989) Neocortex size as a constraint on group size in primates, Journal of Human Evolution, vol. 20, pp. 478 and 484, copyright 1992, with permission from Elsevier.
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