Actori
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Christian RodskaNarrator
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Leticia AvilesHerself - Evolutionary Biologist, University of Arizona
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Jeremy RaynerHimself - Alexander Professor of Zoology, University of Leeds, UK
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Bruce H. TiffneyHimself - Palaeobotanist, University of California, USA
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Stephen HarrisHimself - Mammalogist, Bristol University, UK