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Course image: International Fund for Animal Welfare in Flickr made available under Creative Commons Attribution-NonCommercial 2.0 Licence.
Figures 2a, 5 Dr Alison Ames;
Figures 2b, 17, 18b, c, 22a and b Caroline Pond, Open University;
Figure 7 Mark Eaton;
Figure 10a Bryan and Cherry Alexander Photography;
Figure 10b © Kim Crosbie;
Figures 13 and 14 Donahue, S. W. et al. (2003) Serum markers of bone…, Clinical Orthopaedics and Related Research, 406. Copyright © Dr S. W. Donahue;
Figure 18a Dill, P. B. and Irving, L. (1964) Polar biology, Handbook of Physiology, Chapter 5, American Physiological Society;
Figure 18b, c Dr Malcolm A. Ramsay, University of Saskatchewan, Canada;
Figure 20 Captain Budd Christman, Office of NOAA Photo Library;
Figure 21 Office of NOAA Photo Library;
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