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Course image © David Robinson
Figure 1 © David Robinson
Figure 2 © Theklan / wikimedia; https://creativecommons.org/ licenses/ by-sa/ 4.0/ deed.en
Figure 3(a) © David Robinson
Figure 3(b) © Richard Ellis / Science Photo Library
Figure 4 © David Robinson
Figure 5 Pixabay; https://creativecommons.org/ publicdomain/ zero/ 1.0/ deed.en
Figure 6(a) © David Robinson
Figure 6(b) © David Robinson
Figure 7 Diagram from Bonner, 1980. © Nigel W. Bonner Estate
Figure 8 © CoolAntarctica.com
Figure 9 Diagram adapted from Bonner, 1980. © Nigel W. Bonner Estate
Figure 10 © David Robinson
Figure 11 © David Robinson
Figure 12 © Mike Johnson / SeaPics.com
Figure 13 © SameerPrehistorica
Figure 14 Diagram from Bonner, 1980. © Nigel W. Bonner Estate
Figure 15(a) © David Robinson
Figure 15(b) © Gerard Soury / Getty Images
Figure 16 Diagram from Davis, 1999. Reprinted with permission © American Association for the Advancement of Science
Figure 17 © David Robinson
Figure 18 © Open University
Figure 19 © Gregory "Slobirdr" Smith / flickr; https://creativecommons.org/ licenses/ by-sa/ 2.0/
Figure 20 © Katie Meade
Video 1 © BBC
Video 2 © WildscreenArkive
Video 3 © WildscreenArkive
Video 4 © David Robinson
Audio 1 © David Robinson
Audio 2 © David Robinson
Audio 3 © BBC
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