PAUL D STEWART / SCIENCE PHOTO LIBRARY PAUL D STEWART / SCIENCE PHOTO LIBRARY
Bear skulls of living and extinct species, engraving in Cuvier's "Ossamens Fossiles" (1812). Cuvier, the master of comparative anatomy, referenced modern species with extinct fossils to reveal their affinities and differences. In this section Cuvier examines the modern bear species with reference the extinct Eurasian cave bear Ursus spelaeus.
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