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Course image: Lois Elling in Flickr made available under Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence.
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Figure 1 adapted from Young, J. Z. (1962) The Life of Vertebrates, Oxford University Press;
Figure 2 adapted from Macdonald, D. (ed.) (2001) The New Encyclopedia of Mammals, Oxford University Press.
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