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Figure 2: adapted from Macdonald, D. (ed.) (2001) The New Encyclopedia of Mammals, Oxford University Press;
Figure 3: adapted from Gittleman, J. L. (1989) Carnivore Behaviour, Ecology and Evolution, Comstock Publishing Associates, a division of Cornell University Press;
Figure 5: adapted from Wallis, G. L. (1942) The Vertebrate Eye and its Adaptive Radiation, Harper, New York.
Gavin Bell: http://www.flickr.com/photos/gavinbell/34918312/ [Details correct as of 21st October 2008]