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Aquatic mammals
Aquatic mammals

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Adams, D. (1979) The Hitchhiker's Guide to the Galaxy, London, Picador (this edition 2002).

Bonner, W. N. (1980) Whales, Poole, Blandford Press Ltd.

Darwin, C. (1859) On the Origin of Species, Oxford World's Classics Edition, Oxford University Press (this edition 2008).

Davis, R. W. et al. (1999), ‘Hunting Behavior of a Marine Mammal Beneath the Antarctic Fast Ice’, Science, vol.283, no.5404, pp.993–6. Available at (Accessed 22 January 2019).

Eldredge, N. (1991) Fossils: The Evolution and Extinction of Species, London, Aurum Press.