'Ornithorhynchus Paradoxus', c1885, (1890). From Journal of Researchers into the Natural History and Geology of the Countries Visited during the Voyage of H.M.S. Beagle Round the World, under the Command of Captain Fitz Roy, R.N. by Charles Darwin, M.A., F.R.S. [T. Nelson and Sons, London, 1890]
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