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"All author's ideas are well-argued theoretically and supported by facts ... . The illustrations are rich and worth themselves: The reader has a possibility to see really peculiar images of the past life forms. ... McMenamin's book contains a lot of interesting information, original interpretations, and novel ideas, and, thus, it is recommended to palaeontologists, especially palaeobiologists studying the Cambrian Explosion." (Dmitry A. Ruban, Rostov am Don, Zentralblatt für Geologie und Paläontologie, ISS. 1-2, 2017)