Acknowledgements
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Course image: Nick Fedele in Flickr made available under Creative Commons Attribution-NonCommercial-ShareAlike 2.0 Licence.
Figure 1 English Heritage Photo Library;
Figure 3 Endler, J. A. 1980, 'Natural selection on colour patterns in Poecilia reticulata', Evolution, 34(1), pp. 76-91, AllenPress, Inc.
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