Side View of the Skull of Toxodon is an Enlightenment Pencil Drawing created by Charles Darwin in 1838. The image is in the Public Domain, and tagged Drawing and Skulls. SourceDownload
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Image from Fossil Mammalia Part 1 No. 1 of The zoology of the voyage of H.M.S. Beagle by Richard Owen. Edited and superintended by Charles Darwin.